[ey-tip-i-kuh l]
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Also a·typ·ic.

Origin of atypical

First recorded in 1880–85; a-6 + typical
Related formsa·typ·i·cal·i·ty, nouna·typ·i·cal·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for atypical


  1. not typical; deviating from or not conforming to type
Derived Formsatypically, adverb
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

Word Origin and History for atypical

1847, from a- (2) "not" + typical. Related: Atypically.

Online Etymology Dictionary, © 2010 Douglas Harper

atypical in Medicine


  1. Not corresponding to the normal form or type; not typical.
Related formsa•typi•cal•ly adv.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.