Latin declension#d4

A complete Latin noun declension consists of up to seven grammatical cases: nominative, vocative, accusative, genitive, dative, ablative and locative. However, the locative is limited to a few nouns: generally names of cities, small islands and a few other words.

The Roman grammarian Aelius Donatus (4th century AD), whose work was used as standard throughout the Middle Ages, placed the cases in this order:

:{{lang|la|casus sunt sex: nominativus, genetivus, dativus, accusativus, vocativus, ablativus.}}[https://archive.org/details/corpusgrammatico01linduoft/page/n28/mode/1up Aelius Donatus, Ars Major, 2.8.]

:"There are six cases: nominative, genitive, dative, accusative, vocative and ablative."

This order was based on the order used by earlier Greek grammarians, with the addition of the ablative, which does not exist in Greek. The names of the cases also were mostly translated from the Greek terms, such as {{lang|la|accusativus}} from the Greek {{lang|grc|αἰτῐᾱτῐκή}}.

This traditional order was formerly used in England, such as in The School and University Eton Latin Grammar (1861).Mongan, James Roscoe (1861). The School and University Eton Latin Grammar, Explanatory and Critical. London 1861. That order is still followed in most other European countries. Gildersleeve and Lodge's Latin Grammar (1895) also follow this order. More recent Latin grammars published in the United States, such as Allen and Greenough's New Latin Grammar (1903) and Wheelock's Latin (first published in 1956) follow this order except they list the vocative last.

However, in Britain and countries influenced by Britain other than the United States, the Latin cases are usually given in the following order: nominative, vocative, accusative, genitive, dative, ablative. This order was introduced in Benjamin Hall Kennedy's Latin Primer (1866), with the aim of making tables of declensions easier to recite and memorise (the first three and the last two cases having identical forms in several declensions).{{Full citation needed|date=July 2023}} It is also used in FrancePaul Crouzet (1902), Grammaire Latine, simple et complète, p. 7. and Belgium. In [https://www.youtube.com/watch?v=v6rLLE48RL0 Rosa] (1962), a song in French by the Belgian singer Jacques Brel, Brel sings the declension of "rosa" as {{lang|la|rosa, rosa, rosam}}, following the British order of cases.{{Full citation needed|date=July 2023}}

Syncretism, where one form in a paradigm shares the ending of another form in the paradigm, is common in Latin. The following are the most notable patterns of syncretism:

• For neuter nouns, the nominative, vocative, and accusative cases are identical. The nominative, vocative, and accusative plural almost always ends in -a. (Both of these features are inherited from Proto-Indo-European, and so no actual syncretism is known to have happened in the historical sense, since these cases of these nouns are not known to have ever been different in the first place.)

• The vocative form is always the same as the nominative in the plural, and usually the same as the nominative in the singular except for second-declension nouns ending in -us and a few nouns of Greek origin. For example, the vocative of the first-declension {{wikt-lang|la|Aenēās}} is {{lang|la|Aenēā}}.
• The genitive singular is the same as the nominative plural in first-, second-, and fourth-declension non-neuter Latin nouns.
• The dative singular is the same as the genitive singular in first- and fifth-declension pure Latin nouns.
• The dative is always the same as the ablative in the singular in the second declension, the third-declension full i-stems (i.e. neuter i-stems, adjectives), and fourth-declension neuters.
• The dative, ablative, and locative are always identical in the plural.
• The locative singular is identical to the genitive in the 1st and 2nd declensions; to the dative or ablative in the 3rd declension; to the ablative in the 5th declension.
• The nominative and accusative plurals are identical for all nouns of the 4th declension (in -ūs) and 5th declension (in -ēs), and for many nouns of the 3rd declension (in -ēs; but a distinct accusative plural in -īs can be used in Classical Latin for some i-stem nouns).

Old Latin had essentially two patterns of endings. One pattern was shared by the first and second declensions, which derived from the Proto-Indo-European thematic declension. The other pattern was used by the third, fourth and fifth declensions, and derived from the athematic PIE declension.

There are two principal parts for Latin nouns: the nominative singular and the genitive singular. Each declension can be unequivocally identified by the ending of the genitive singular (-ae, -i, -is, -ūs, -ei). The stem of the noun can be identified by the form of the genitive singular as well.

There are five declensions for Latin nouns:

Nouns of this declension usually end in -a in the nominative singular and are mostly feminine, e.g. {{wikt-lang|la|via|via, viae}} {{abbr|f.|feminine}} ('road') and {{wikt-lang|la|aqua|aqua, aquae}} {{abbr|f.|feminine}} ('water'). There is a small class of masculine exceptions generally referring to occupations, e.g. {{wikt-lang|la|poeta|poēta, poētae}} {{abbr|m.|masculine}} ('poet'), {{wikt-lang|la|agricola|agricola, agricolae}} {{abbr|m.|masculine}} ('farmer'), {{wikt-lang|la|auriga|auriga, aurigae}} {{abbr|m.|masculine}} ('auriga, charioteer'), {{wikt-lang|la|pirata|pīrāta, pīrātae}} {{abbr|m.|masculine}} ('pirate') and {{wikt-lang|la|nauta|nauta, nautae}} {{abbr|m.|masculine}} ('sailor').

The predominant letter in the ending forms of this declension is a. The nominative singular form consists of the stem and the ending -a, and the genitive singular form is the stem plus -ae.

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The locative endings for the first declension are -ae (singular) and -īs (plural), similar to the genitive singular and ablative plural, as in {{wikt-lang|la|mīlitia|mīlitiae}} 'in war' and {{wikt-lang|la|Athēnae|Athēnīs}} 'at Athens'.Allen and Greenough. §43 c.

{{Main|Declension of Greek nouns in Latin}}

The first declension also includes three types of Greek loanwords, derived from Ancient Greek's alpha declension. They are declined irregularly in the singular, but sometimes treated as native Latin nouns, e.g. nominative {{wikt-lang|la|athleta|athlēta}} ('athlete') instead of the original athlētēs. Archaic (Homeric) first declension Greek nouns and adjectives had been formed in exactly the same way as in Latin: nephelēgeréta Zeus ('Zeus the cloud-gatherer') had in classical Greek become nephelēgerétēs.

For full paradigm tables and more detailed information, see the Wiktionary appendix First declension.

The second declension is a large group of nouns consisting of mostly masculine nouns like {{wikt-lang|la|equus|equus, equī}} ('horse') and {{wikt-lang|la|puer|puer, puerī}} ('boy') and neuter nouns like {{wikt-lang|la|castellum|castellum, castellī}} ('fort'). There are several small groups of feminine exceptions, including names of gemstones, plants, trees, and some towns and cities.

In the nominative singular, most masculine nouns consist of the stem and the ending -us, although some end in -er, which is not necessarily attached to the complete stem. Neuter nouns generally have a nominative singular consisting of the stem and the ending -um. However, every second-declension noun has the ending -ī attached as a suffix to the root of the noun in the genitive singular form. The predominant letter in the ending forms of this declension is o.

The locative endings for the second declension are -ī (singular) and -īs (plural); {{wikt-lang|la|Corinthus|Corinthī}} "at Corinth", {{wikt-lang|la|Mediolanum|Mediolānī}} "at Milan", and {{wikt-lang|la|Philippi|Philippīs}} "at Philippi".Allen and Greenough. §49 a.

Nouns ending in -ius and -ium have a genitive singular in -ī in earlier Latin, which was regularized to -iī in the later language. Masculine nouns in -ius have a vocative singular in -ī at all stages. These forms in -ī are stressed on the same syllable as the nominative singular, sometimes in violation of the usual Latin stress rule. For example, the genitive and vocative singular Vergilī (from {{wikt-lang|la|Vergilius}}) is pronounced Vergílī, with stress on the penult, even though it is short.Gildersleeve & Lodge §15, Allen & Greenough §12, §49c In Old Latin, however, the vocative was declined regularly, using -ie instead, e.g. fīlie "[O] son", archaic vocative of {{Lang|la|fīlius}}.

There is no contraction of -iī(s) in plural forms and in the locative.

In the older language, nouns ending with -vus, -quus and -vum take o rather than u in the nominative and accusative singular. For example, {{wikt-lang|la|servis|servus, servī}} ('slave') could be servos, accusative servom.

Some masculine nouns of the second declension end in -er or -ir in the nominative singular. The declension of these nouns is identical to that of the regular second declension, except for the lack of suffix in the nominative and vocative singular.

Some (but not all) nouns in -er drop the e in the genitive and other cases. For example, {{wikt-lang|la|socer|socer, socerī}} ('father-in-law') keeps its e. However, the noun {{wikt-lang|la|magister|magister, magistrī}} ('(school)master') drops its e in the genitive singular.

For declension tables of second-declension nouns, see the corresponding Wiktionary appendix.

The vocative puere is found but only in Plautus.[https://www.perseus.tufts.edu/hopper/searchresults?target=la&all_words=puere Perseus database.] The genitive plural virum is found in poetry.Gildersleeve & Lodge, Latin Grammar 3rd ed., p. 17.

{{Main|Declension of Greek nouns in Latin}}

The second declension contains two types of masculine Greek nouns and one form of neuter Greek noun. These nouns are irregular only in the singular, as are their first-declension counterparts. Greek nouns in the second declension are derived from the Omicron declension.

Some Greek nouns may also be declined as normal Latin nouns. For example, {{wikt-lang|la|theātron}} can appear as theātrum.

The inflection of {{wikt-lang|la|deus|deus, deī}} ('god') is irregular. The vocative singular of deus is not attested in Classical Latin. In Ecclesiastical Latin the vocative of Deus ('God') is Deus.

In poetry, -um may substitute -ōrum as the genitive plural ending.

Three words, although second declension neuter, end in -us. These are {{lang|la|vulgus}} "common people, crowd", {{lang|la|vīrus}} "slime, poison", and (borrowed from Greek) {{lang|la|pontus}} "sea".Ernout (1953), p. 34.

The word {{lang|la|vīrus}} means "1. slimy liquid, slime; 2. poison, venom", denoting the venom of a snake. This Latin word is probably related to the Greek {{wikt-lang|grc|ῑ̓ός}} (ios) meaning "venom" or "rust" and the Sanskrit word {{wikt-lang|sa|विष}} {{transl|sa|viṣa}} meaning "toxic, poison".Chambers' Etymological Dictionary Enlarged Edition 1931.

Since {{lang|la|vīrus}} in antiquity denoted something uncountable, it was a mass noun. Mass nouns pluralize only under special circumstances, hence the non-existence of plural forms in the texts.June 1999 issue of ASM News by the American Society for Microbiology

In Neo-Latin, a plural form is necessary in order to express the modern concept of 'viruses', which leads to the following declension:[https://web.archive.org/web/20170728043240/interrete.de/latein/nuntiifinarch1.html Nuntii Latini: Finnish Broadcasting Company (Radiophonia Finnica Generalis). Archiv I. 19.5.2000 – 6.12.2002]: "NOVUM VIRUS COMPUTATORIUM
Novum viri computatorii genus nomine Code Red in praesenti in Interreti grassatur, ut nuntiavit institutum SANS, cuius est securitati retis informatici providere. Code Red II, quod per cursum electronicum diffunditur, priore viro acerbius est et, postquam in servitoria penetravit, in systema lacunam facit. Ita fieri potest, ut alia vira eaque etiam periculosiora in machinas computatorias irrepant. Iam vermis Code Red I molestissimus fuit, cum biduo in trecenta milia computatrorum in omni orbe terrarum invasit."[https://de.pons.com/%C3%BCbersetzung?l=dela&q=virus Pons: virus]William T. Stearn: Botanical Latin. History, Grammar, Syntax, Terminology and Vocabulary. David & Charles, third edition, 1983. Quote: "Virus: virus (s.n. II), gen. sing. viri, nom. pl. vira, gen. pl. vīrorum (to be distinguished from virorum, of men)."

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The third declension is the largest group of nouns. The nominative singular of these nouns may end in -a, -e, -ī, -ō, -y, -c, -l, -n, -r, -s, -t, or -x. This group of nouns includes masculine, neuter, and feminine nouns.

The stem of a consonant-stem noun may be found from the genitive case by removing the ending -is. For example, the stem of {{wikt-lang|la|pax|pāx, pācis}} {{abbr|f.|feminine}} 'peace' is pāc-, the stem of {{wikt-lang|la|flumen|flūmen, flūminis}} {{abbr|n.|neuter}} 'river' is flūmin-, and the stem of {{wikt-lang|la|flos|flōs, flōris}} {{abbr|m.|masculine}} 'flower' is flōr-.

Masculine, feminine and neuter nouns often have their own special nominative singular endings. For instance, many masculine nouns end in -or ({{wikt-lang|la|amor|amor, amōris}}, 'love'). Many feminine nouns end in -īx ({{wikt-lang|la|phoenix|phoenīx, phoenīcis}}, 'phoenix'), and many neuter nouns end in -us with an r stem in the oblique cases ({{wikt-lang|la|onus|onus, oneris}} 'burden'; {{wikt-lang|la|tempus|tempus, temporis}} 'time').

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The locative endings for the third declension are -ī or -e (singular) and -ibus (plural), as in {{wikt-lang|la|rus|rūrī}} 'in the country' and {{wikt-lang|la|Tralles|Trallibus}} 'at Tralles'.Allen and Greenough. §80.

The third declension also has a set of nouns that are declined differently. They are called i-stems. i-stems are broken into two subcategories: pure and mixed. Pure i-stems are indicated by special neuter endings. Mixed i-stems are indicated by the double consonant rule. Stems indicated by the parisyllabic rule are usually mixed, occasionally pure.

;Masculine and feminine

:Parisyllabic rule: Some masculine and feminine third-declension i-stem nouns have the same number of syllables in the genitive and the nominative. For example: {{wikt-lang|la|navis|nāvis, nāvis}} ('ship'); {{wikt-lang|la|nubes|nūbēs, nūbis}} ('cloud'). The nominative ends in -is or -ēs.

:Double consonant rule: The rest of the masculine and feminine third-declension i-stem nouns have two consonants before the -is in the genitive singular. For example: {{wikt-lang|la|pars|pars, partis}} ('part').

;Neuter

:Special neuter ending: Neuter third-declension i-stems have no rule. However, all of them end in -al, -ar or -e. For example: {{wikt-lang|la|animal|animal, animālis}} ('animal'); {{wikt-lang|la|cochlear|cochlear, cochleāris}} ('spoon'); {{wikt-lang|la|mare|mare, maris}} ('sea').

The mixed declension is distinguished from the consonant type only by having -ium in the genitive plural (and occasionally -īs in the accusative plural). The pure declension is characterized by having -ī in the ablative singular, -ium in the genitive plural, -ia in the nominative and accusative plural neuter, and -im in the accusative singular masculine and feminine (however, adjectives have -em).

The accusative plural ending -īs is found in early Latin up to Virgil, but from the early empire onwards it was replaced by -ēs.Gildersleeve & Lodge (1895), p. 18.

The accusative singular ending -im is found only in a few words: always in {{lang|la|tussis}} 'cough', {{lang|la|sitis}} 'thirst', {{lang|la|Tiberis}} 'River Tiber'; usually in {{lang|la|secūris}} 'axe', {{lang|la|turris}} 'tower', {{lang|la|puppis}} 'poop', {{lang|la|febris}} 'fever'; occasionally in {{lang|la|nāvis}} 'ship'. Most nouns, however, have accusative singular -em.Gildersleeve & Lodge (1895), p. 27. The ending -im is not found in any adjectives, even those that have a separate feminine such as {{lang|la|celeris}} 'swift' or {{Lang|la|ācris}} 'keen',Ernout, A. (1953), {{lang|fr|Morphologie historique du latin}}, p. 50. or in any masculine common nouns.

The ablative singular -ī is found in nouns which have -im, and also, optionally, in some other nouns, e.g. {{lang|la|in ignī}} or {{lang|la|in igne}} 'in the fire'.

There are two mixed-declension neuter nouns: {{wikt-lang|la|cor|cor, cordis}} ('heart') and {{wikt-lang|la|os|os, ossis}} ('bone'). The mixed declension is also used in the plural-only adjective {{wikt-lang|la|plures|plūrēs, plūra}} ('most').

The rules for determining i-stems from non-i-stems and mixed i-stems are guidelines rather than rules: many words that might be expected to be i-stems according to the parisyllabic rule actually are not, such as {{wikt-lang|la|canis}} ('dog') or {{wikt-lang|la|iuvenis}} ('youth'), which have genitive plural {{lang|la|canum}} 'of dogs' and {{lang|la|iuvenum}} 'of young men'. Likewise, {{wikt-lang|la|pater}} ('father'), {{wikt-lang|la|māter}} ('mother'), {{wikt-lang|la|frāter}} ('brother'), and {{wikt-lang|la|parēns}} ('parent') violate the double-consonant rule. This fluidity even in Roman times resulted in much more uncertainty in Medieval Latin.

Some nouns in -tāt-, such as {{wikt-lang|la|civitas|cīvitās, cīvitātis}} 'city, community' can have either consonant-stem or i-stem genitive plural: {{lang|la|cīvitātum}} or {{lang|la|cīvitātium}} 'of the cities'.

In the third declension, there are four irregular nouns.

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The fourth declension is a group of nouns consisting of mostly masculine words such as {{wikt-lang|la|flūctus|flūctus, flūctūs}} {{abbr|m.|masculine}} ('wave') and {{wikt-lang|la|portus|portus, portūs}} {{abbr|m.|masculine}} ('port') with a few feminine exceptions, including {{wikt-lang|la|manus|manus, manūs}} {{abbr|f.|feminine}} ('hand') and {{wikt-lang|la|domus|domus, domūs}} {{abbr|f.|feminine}} ('house'). The fourth declension also includes several neuter nouns including {{wikt-lang|la|genu|genū, genūs}} {{abbr|n.|neuter}} ('knee'). Each noun has the ending -ūs as a suffix attached to the root of the noun in the genitive singular form. The predominant letter in the ending forms of this declension is u, but the declension is otherwise very similar to the third-declension i stems.

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• In the genitive singular, cornūs may in later times be replaced by cornū.

• The locative endings for the fourth declension are -ī (singular) and -ibus (plural); {{wikt-lang|la|senatus|senātī}} "at [the] senate", {{wikt-lang|la|domus|domī}} "at home".

{{wikt-lang|la|domus|Domus}} ('house, dwelling, building, home, native place, family, household, race') is an irregular noun, mixing fourth and second declension nouns at the same time (especially in literature). However, in practice, it is generally declined as a regular -us stem fourth declension noun, except for ablative singular -ō, accusative plural -ōs, and the use of the locative.[https://www.youtube.com/watch?v=33n1qYq9Liw The Fourth Declension] – tutorial by Ben Johnson of [https://latintutorial.com/about LatinTutorial]

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The fifth declension is a small group of nouns consisting of mostly feminine nouns like {{wikt-lang|la|res|rēs, reī}} {{abbr|f.|feminine}} ('affair, matter, thing') and diēs, diēī {{abbr|m.|masculine}} ('day'; but {{abbr|f.|feminine}} in names of days).

Nouns ending in -iēs have long ēī in the dative and genitive, while nouns ending in a consonant + -ēs usually have short eī in these cases. Other forms of the genitive singular are also found, such as {{lang|la|diī}} (Aeneid 1.636), {{lang|la|diē}} (Georgic 1.208), {{lang|la|diēs}} (Ennius).Ernout (1953), p. 69.

The locative ending of the fifth declension was -ē (singular only), identical to the ablative singular, as in {{wikt-lang|la|hodiē}} ('today').

The first and second persons are irregular, and both pronouns are indeclinable for gender; and the third person reflexive pronoun sē, suī always refers back to the subject, regardless of whether the subject is singular or plural.

The genitive forms {{wikt-lang|la|meī}}, {{wikt-lang|la|tuī}}, {{wikt-lang|la|nostrī}}, {{wikt-lang|la|vestrī}}, {{wikt-lang|la|suī}} are used as complements in certain grammatical constructions, whereas {{wikt-lang|la|nostrum}}, {{wikt-lang|la|vestrum}} are used with a partitive meaning ('[one] of us', '[one] of you'). To express possession, the possessive pronouns (essentially adjectives) {{wikt-lang|la|meus}}, {{wikt-lang|la|tuus}}, {{wikt-lang|la|noster}}, {{wikt-lang|la|vester}} are used, declined in the first and second declensions to agree in number and case with the thing possessed, e.g. {{lang|la|pater meus}} 'my father', {{lang|la|māter mea}} 'my mother'. The vocative singular masculine of {{lang|la|meus}} is {{lang|la|mī}}: {{lang|la|mī Attice}} 'my dear Atticus'.Cicero, Epistulae ad Atticum 6.1.20 etc.

The possessive adjective {{lang|la|vester}} has an archaic variant, {{lang|la|voster}}; similar to {{lang|la|noster}}. Vocative of {{lang|la|meus}} is usually {{lang|la|mī}}, and rarely {{lang|la|meus}} also, like the nominative.

Usually, to show the ablative of accompaniment, {{wikt-lang|la|cum}} would be added to the ablative form. However, with personal pronouns (first and second person), the reflexive and the interrogative, -cum is added onto the end of the ablative form. That is: {{wikt-lang|la|mēcum}} 'with me', {{wikt-lang|la|nōbīscum}} 'with us', {{wikt-lang|la|tēcum}} 'with you', {{wikt-lang|la|vōbīscum}}, {{wikt-lang|la|sēcum}} and {{wikt-lang|la|quōcum}} (sometimes {{wikt-lang|la|quīcum}}).

Pronouns have also an emphatic form bi using the suffix -met ({{wikt-lang|la|egomet}}, {{wikt-lang|la|tūte}}/{{wikt-lang|la|tūtemet}}, {{wikt-lang|la|nosmet}}, {{wikt-lang|la|vosmet}}), used in all cases, except by the genitive plural forms.

In accusative case, the forms mēmē and tētē exist as emphatic, but they are not widely used.

{{wikt-lang|la|se|Sē, suī}} has a possessive adjective: {{wikt-lang|la|suus|suus, sua, suum}}, meaning 'his/her/its/their own':

:{{lang|la|Patrem suum numquam vīderat.}} (Cicero)Cicero, Pro Rabirio Postumo 4

:"He had never seen his [own] father."

When 'his' or 'her' refers to someone else, not the subject, the genitive pronoun {{lang|la|eius}} (as well as eōrum and eārum) 'of him' is used instead of suus:

:{{lang|la|Fit obviam Clodiō ante fundum eius.}} (Cicero)Cicero, Pro Milone 29

:"He met Clodius in front of the latter's farm."

Despite its resemblance to the possessive adjectives {{lang|la|meus, tuus}} and {{lang|la|suus}}, {{lang|la|eius}} does not decline in agreement with the noun it refers to, in the way that an adjective would. For instance, "his father" in the accusative is {{lang|la|patrem eius}} (literally, "father of him"), not {{lang|la|patrem}} *eium, in contrast with the reflexive formation {{lang|la|patrem suum}} ("his [own] father").

When one sentence is embedded inside another with a different subject, sē and suus can refer to either subject:

:{{lang|la|Patrēs conscrīptī ... lēgātōs in Bīthȳniam miserunt quī ab rēge peterent, nē inimīcissimum suum secum haberet sibique dēderet.}} (Nepos)Cornelius Nepos, Hannibal 12.2

:"The senators ... sent ambassadors to Bithynia, who were to ask the king not to keep their greatest enemy with him but hand him over to them."

For the third-person pronoun {{wikt-lang|la|is}} 'he', see below.

Relative, demonstrative and indefinite pronouns are generally declined like first and second declension adjectives, with the following differences:

• the nominatives are often irregular
• the genitive singular ends in -īus rather than -ae or -ī.
• the dative singular ends in -ī: rather than -ae or -ō.

These differences characterize the pronominal declension, and a few special adjectives ({{wikt-lang|la|tōtus}} 'whole', {{wikt-lang|la|sōlus}} 'alone', {{wikt-lang|la|ūnus}} 'one', {{wikt-lang|la|nūllus}} 'no', {{wikt-lang|la|alius}} 'another', {{wikt-lang|la|alter}} 'another [of two]', etc.) are also declined according to this pattern.

All demonstrative, relative, and indefinite pronouns in Latin can also be used adjectivally, with some small differences; for example in the interrogative pronoun, {{wikt-lang|la|quis}} 'who?' and {{wikt-lang|la|quid}} 'what?' are usually used for the pronominal form, {{wikt-lang|la|quī}} and {{wikt-lang|la|quod}} 'which?' for the adjectival form.

The weak demonstrative pronoun {{wikt-lang|la|is}}, {{wikt-lang|la|ea}}, {{wikt-lang|la|id}} 'that' also serves as the third person pronoun 'he, she, it':

This pronoun is also often used adjectivally, e.g. is homo 'that man', ea pecunia 'that money'. It has no possessive adjective; the genitive is used instead: pater eius 'his/her father'; pater eōrum 'their father'.

The pronoun or pronominal adjective {{wikt-lang|la|idem|īdem, eadem, idem}} means 'the same'. It is derived from is with the suffix -dem. However, some forms have been assimilated.

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Similar in declension is {{wikt-lang|la|alius|alius, alia, aliud}} 'another'.

The interrogative pronouns are used strictly for asking questions. They are distinct from the relative pronoun and the interrogative adjective (which is declined like the relative pronoun). Interrogative pronouns rarely occur in the plural. The plural interrogative pronouns are the same as the plural relative pronouns.

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First- and second-declension adjectives are inflected in the masculine, the feminine and the neuter; the masculine form typically ends in -us (although some end in -er, see below), the feminine form ends in -a, and the neuter form ends in -um. Therefore, some adjectives are given like {{wikt-lang|la|altus|altus, alta, altum}}.

Adjectives ending -ius use the vocative -ie (ēbrie, "[O] drunk man", vocative of ēbrius), just as in Old Latin all -ius nouns did (fīlie, "[O] son", archaic vocative of fīlius).

Some first- and second-declension adjectives' masculine forms end in -er. As with second-declension -r nouns, some adjectives retain the e throughout inflection, and some omit it. {{wikt-lang|la|sacer|Sacer, sacra, sacrum}} omits its e while {{wikt-lang|la|miser|miser, misera, miserum}} keeps it.

Nine first and second declension pronominal adjectives are irregular in the genitive and dative singular in all genders. They can be remembered by using the mnemonic acronym {{lang|la|ūnus nauta}}. They are:

• {{wikt-lang|la|ullus|ūllus, ūlla, ūllum}} 'any';
• {{wikt-lang|la|nullus|nūllus, nūlla, nūllum}} 'no, none';
• {{wikt-lang|la|uter|uter, utra, utrum}} 'which [of two], either';
• {{wikt-lang|la|solus|sōlus, sōla, sōlum}} 'sole, alone';
• {{wikt-lang|la|neuter|neuter, neutra, neutrum}} 'neither';
• {{wikt-lang|la|alius|alius, alia, aliud}} 'another' (the genitive singular alīus is often replaced by alterīus or by aliēnus 'of another');Gildersleeve & Lodge (1903), Gildersleeve's Latin Grammar, p. 39.
• {{wikt-lang|la|unus|ūnus, ūna, ūnum}} 'one';
• {{wikt-lang|la|totus|tōtus, tōta, tōtum}} 'whole';
• {{wikt-lang|la|alter|alter, altera, alterum}} 'other [of two]'.

Third-declension adjectives are normally declined like third-declension i-stem nouns, except for the fact they usually have -ī rather than -e in the ablative singular (unlike i-stem nouns, in which only pure i-stems have -ī). Some adjectives, however, like the one-ending {{wikt-lang|la|vetus|vetus, veteris}} ('old, aged'), have -e in the ablative singular, -um in the genitive plural, and -a in the nominative and accusative neuter plural.

====Third-declension adjectives with one ending====

These have a single nominative ending for all genders, although as usual the endings for the other cases vary. As with nouns, a genitive is given for the purpose of showing the inflection.

Third-declension adjectives that have two endings have one form for the masculine and feminine, and a separate form for the neuter. The ending for the masculine and feminine is -is, and the ending for the neuter is -e. It is not necessary to give the genitive, as it is the same as the nominative masculine singular.

Third-declension adjectives with three endings have three separate nominative forms for all three genders. Like third and second declension -r nouns, the masculine ends in -er. The feminine ends in -ris, and the neuter ends in -re. The genitive is the same as the nominative feminine singular.

As in English, adjectives have superlative and comparative forms. For regular first and second declension and third declension adjectives with one or two endings, the comparative is formed by adding -ior for the masculine and feminine, and -ius for the neuter to the stem. The genitives for both are formed by adding -iōris. Therefore, they are declined in the third declension, but they are not declined as i-stems. Superlatives are formed by adding -issimus, -issima, -issimum to the stem and are thus declined like first and second declension adjectives.

Adjectives (in the first and second as well as third declensions) that have masculine nominative singular forms ending in -er are slightly different. As with normal adjectives, the comparative is formed by adding -ior to the stem, but for the superlative, -rimus is added to the nominative masculine singular.

Some third declension adjectives with two endings in -lis in the masculine–feminine nominative singular have irregular superlative forms. The following are the only adjectives that do.

First and second declension adjectives that end in -eus or -ius are unusual in that they do not form the comparative and superlative by taking endings at all. Instead, {{wikt-lang|la|magis}} ('more') and {{wikt-lang|la|maximē}} ('most'), the comparative and superlative degrees of {{wikt-lang|la|magnoperē}} ('much, greatly'), respectively, are used.

Many adjectives in -uus, except those in -quus or -guus, also follow this rule.

As in most languages, Latin has adjectives that have irregular comparatives and superlatives.

{{notelist-lr}}

{{see also|Roman numerals|Latin numerals (linguistics)}}

There are several different kinds of numeral words in Latin: the two most common are cardinal numerals and ordinal numerals. There are also several more rare numerals, e.g., distributive numerals and adverbial numerals.

All cardinal numerals are indeclinable, except {{wikt-lang|la|ūnus}} ('one'), {{wikt-lang|la|duo}} ('two'), {{wikt-lang|la|trēs}} ('three'), plural hundreds {{wikt-lang|la|ducentī}} ('two hundred'), {{wikt-lang|la|trecentī}} ('three hundred') etc., and {{wikt-lang|la|mīlle}} ('thousand'), which have cases and genders like adjectives. {{wikt-lang|la|unus|Ūnus, ūna, ūnum}} is declined like a first- and second-declension pronoun with -īus or -ius in the genitive, and -ī in the dative. {{wikt-lang|la|duo|Duo}} is declined irregularly, {{wikt-lang|la|trēs}} is declined like a third-declension plural adjective, -centī ('hundred') numerals decline like first- and second-declension adjectives, and {{wikt-lang|la|mīlle}} is invariable in the singular and declined like a third-declension i-stem neuter noun in the plural:

The plural endings for ūnus are used with plūrālia tantum nouns, e. g. ūna castra (one [military] camp), ūnae scālae (one ladder).

The word {{wikt-lang|la|ambō}} ('both'), is declined like duo except that its o is long. Both declensions derive from the Indo-European dual number, otherwise defunct in Latin, rather than the plural.

The numeral {{wikt-lang|la|centum}} ('one hundred') is indeclinable, but all the other hundred numerals are declinable ({{wikt-lang|la|ducentī}}, {{wikt-lang|la|trecentī}}, {{wikt-lang|la|quadringentī}}, {{wikt-lang|la|quīngentī}}, {{wikt-lang|la|sescentī}}, {{wikt-lang|la|septingentī}}, {{wikt-lang|la|octingentī}}, {{wikt-lang|la|nōngentī}}).

The word mīlle 'thousand' is a singular indeclinable adjective. However, its plural, mīlia, is a plural third-declension i-stem neuter noun. To write the phrase "four thousand horses" in Latin, the genitive is used: quattuor mīlia equōrum, literally, "four thousands of horses".

The rest of the numbers are indeclinable whether used as adjectives or as nouns.

For further information on the different sets of Latin numerals, see Latin numerals (linguistics).

Adverbs are not declined. However, adverbs must be formed if one wants to make an adjective into an adverb.

First and second declension adjectives' adverbs are formed by adding -ē onto their stems.

Typically, third declension adjectives' adverbs are formed by adding -iter to the stem. However, most third declension adjectives with one ending simply add -er to the stem.

Adverbs' comparative forms are identical to the nominative neuter singular of the corresponding comparative adjective. Adverbs' superlative forms are simply formed by attaching the regular ending -ē to the corresponding superlative adjective. As with their corresponding adjectival forms, first and second declensions adjectives ending in -eus or -ius use {{wikt-lang|la|magis}} and {{wikt-lang|la|maximē}} as opposed to distinct endings.

As with adjectives, there are irregular adverbs with peculiar comparative and superlative forms.

Some nouns are only used in the singular (singulare tantum) such as:

• materials, such as {{wikt-lang|la|aurum}} 'gold'

Some nouns are only used in the plural (plurale tantum), or when plural have a singular meaning such as:

• many festivals, such as {{wikt-lang|la|Saturnālia}} 'Saturnalia'
• {{wikt-lang|la|castra}} 'camp' and {{wikt-lang|la|arma}} 'arms'; {{wikt-lang|la|littera|litterae}} 'a letter' (cf. {{lang|la|littera}} 'letter of the alphabet')
• a few geographical names are plural such as {{wikt-lang|la|Thēbae}} 'Thebes' (both the Greek and the Egyptian cities)

Indeclinable nouns are nouns which only have one form in all cases (of the singular).

• {{wikt-lang|la|fās}} ('divine law')
• {{wikt-lang|la|īnstar}} ('likeness')
• {{wikt-lang|la|māne}} ('morning')
• {{wikt-lang|la|nefās}} ('sin, abomination')
• {{wikt-lang|la|secus}} ('(male or female) sex')

Heterogeneous nouns are nouns which vary in respect to gender.

• A few nouns in the second declension occur in both the neuter and masculine. However, their meanings remain the same.
• Some nouns are one gender in the singular, but become another gender in the plural. They may also change in meaning.

{{notelist-lr}}

• Declension of Greek nouns in Latin
• Latin conjugation
• Latin mnemonics
• William Whitaker's Words
• Greek declension

{{reflist}}

• [https://gutenberg.org/ebooks/15665 New Latin Grammar], an eBook, originally written by Charles Edwin Bennett, at the Project Gutenberg
• [https://students.open.ac.uk/arts/a276/OU_Interactive_Latin Interactive Latin Word Endings]
• {{cite book |title=Gildersleeve's Latin Grammar |last=Gildersleeve |first=B. L. |author-link=Basil Lanneau Gildersleeve |author2=Gonzalez Lodge |year=1895 |edition=3rd |publisher=Macmillan |isbn=0-333-09215-5}}
• {{cite book |title=Allen and Greenough's New Latin Grammar for Schools and Colleges |last=Greenough |first=J. B. |author-link=James Bradstreet Greenough |author2=G. L. Kittredge |author3=A. A. Howard |author4=Benj. L. D'Ooge |year=1903 |publisher=Ginn and Company |url=https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3atext%3a1999.04.0001}}
• Ernout, A. (1953). {{lang|fr|Morphologie historique du latin}}. Klincksieck, Paris.

{{Grammatical cases}}

la:Declinatio (grammatica)