Deviation

Deviation may refer to:

Mathematics and engineering

Allowance (engineering), an engineering and machining allowance is a planned deviation between an actual dimension and a nominal or theoretical dimension, or between an intermediate-stage dimension and an intended final dimension.
Deviation (statistics), the difference between the value of an observation and the mean of the population in mathematics and statistics
Standard deviation, which is based on the square of the difference
Absolute deviation, where the absolute value of the difference is used
Relative standard deviation, in probability theory and statistics is the absolute value of the coefficient of variation
Deviation of a local ring in mathematics
Deviation of a poset in mathematics
Frequency deviation, the maximum allowed "distance" in FM radio from the nominal frequency a station broadcasts at
Magnetic deviation, the error induced in compasses by local magnetic fields

Bid‘ah, Islamic term for innovations and deviations acts or groups from orthodox Islamic law (Sharia).
Deviance (sociology), a behavior that is a recognized violation of social norms
Deviation (1971 film), a horror film
Deviation (2006 film), a short film
Deviation, a 2012 British thriller film starring Danny Dyer
Deviation (law) is a departure from a contract or a ship's course, thus breaching the contract
Deviationism, an expressed belief which is not in accordance with official party doctrine
A work of art in the online community DeviantArt