English Reference
noun

deviate

n.
US /ˈdiviˌeɪt/ de·vi·ate UK spelling deviated, deviates, deviating

  1. 01 C2 Proficiency Technical Math

    the difference between a measured number and the average or expected number.

    the difference between an observed value and a reference value, such as the mean. Used primarily in quantitative analysis.

    Simple

    The scientist calculated the deviate to see how far the result was from the average.

    In context

    In this statistical model, each deviate must be squared to ensure that negative values do not cancel out the positive ones during the final calculation.

  2. 02 C2 Proficiency FormalTechnical Sociology

    a person whose behavior is very different from what society considers normal.

    a person whose attitudes or behavior depart from established social or moral norms. Often carries a negative or clinical connotation.

    Simple

    In the past, anyone who did not follow local traditions was labeled a deviate.

    In context

    The sociological study examined how the community identifies and subsequently isolates individuals perceived as social deviates.

    Teacher's tip

    In modern casual English, 'deviant' is much more common as a noun than 'deviate'.

    misfitnonconformistdeviant
    conformist

It also claimed the convoy had deviated from the route that had been coordinated with the military.

BBC News· 20 Aug 2026

These include whether it deviates from a perfect sphere, and whether the black hole has any additional properties beyond spin that influence its behavior.

Ars Technica· 19 Aug 2026

Etymology 1

From Late Latin dēviātus, perfect passive participle of dēviō, see -ate (verb-forming suffix) for more. Compare French dévier.

Etymology 2

From a substantivation of Late Latin dēviātus, see Etymology 1 and -ate (noun-forming suffix) for more.

Etymology 3

From Late Latin dēviātus, see Etymology 1 and -ate (adjective-forming suffix) for more.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin la-lat dēviātus
Level C1 · Advanced
Frequency Occasional
Updated