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deviation

[dee-vee-ey-shuh n] /ˌdi viˈeɪ ʃən/
noun
1.
the act of deviating.
2.
departure from a standard or norm.
3.
Statistics. the difference between one of a set of values and some fixed value, usually the mean of the set.
4.
Navigation. the error of a magnetic compass, as that of a ship, on a given heading as a result of local magnetism.
Compare variation (def 8).
5.
Optics.
  1. Also called deflection. the bending of rays of light away from a straight line.
  2. angle of deviation.
6.
departure or divergence from an established dogma or ideology, especially a Communist one.
Origin
late Middle English
1375-1425
1375-1425; late Middle English (< Middle French) < Medieval Latin dēviātiōn- (stem of dēviātiō), equivalent to Late Latin dēviāt(us) (see deviate) + -iōn- -ion
Related forms
deviatory
[dee-vee-uh-tawr-ee, -tohr-ee] /ˈdi vi əˌtɔr i, -ˌtoʊr i/ (Show IPA),
deviative, adjective
nondeviation, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for deviative

deviation

/ˌdiːvɪˈeɪʃən/
noun
1.
an act or result of deviating
2.
(statistics) the difference between an observed value in a series of such values and their arithmetic mean
3.
the error of a compass due to local magnetic disturbances
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for deviative

deviation

n.

1640s, noun of action from deviate (v.). Statistical sense is from 1858. Related: Deviational.

Online Etymology Dictionary, © 2010 Douglas Harper
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deviative in Medicine

deviation de·vi·a·tion (dē'vē-ā'shən)
n.

  1. A turning away or aside from a normal course.

  2. An abnormality.

  3. Deviant behavior or attitudes.

  4. The difference, especially the absolute difference, between one number in a set and the mean of the set.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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deviative in Science
deviation
  (dē'vē-ā'shən)   
The difference between one number in a set and the mean of the set.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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