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-ism

  1. a suffix appearing in loanwords from Greek, where it was used to form action nouns from verbs (baptism); on this model, used as a productive suffix in the formation of nouns denoting action or practice, state or condition, principles, doctrines, a usage or characteristic, devotion or adherence, etc. (criticism; barbarism; Darwinism; despotism; plagiarism; realism; witticism; intellectualism).
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Compare -ist, -ize.

Origin of -ism

< Greek -ismos, -isma noun suffixes, often directly, often through Latin -ismus, -isma, sometimes through French -isme, German -ismus (all ultimately < Gk)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for -ism

-ism

suffix forming nouns
  1. indicating an action, process, or resultcriticism; terrorism
  2. indicating a state or conditionpaganism
  3. indicating a doctrine, system, or body of principles and practicesLeninism; spiritualism
  4. indicating behaviour or a characteristic qualityheroism
  5. indicating a characteristic usage, esp of a languagecolloquialism; Scotticism
  6. indicating prejudice on the basis specifiedsexism; ageism
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Word Origin

from Old French -isme, from Latin -ismus, from Greek -ismos
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 -ism

suffix forming nouns of action, state, condition, doctrine, from French -isme or directly from Latin -isma, -ismus, from Greek -isma, from stem of verbs in -izein. Used as an independent word, chiefly disparagingly, from 1670s.

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Online Etymology Dictionary, © 2010 Douglas Harper

-ism in Medicine

-ism

suff.
  1. Action, process; practice:vegetarianism.
  2. Characteristic behavior or quality:puerilism.
  3. State; condition; quality:senilism.
  4. State or condition resulting from an excess of something specified:strychninism.
  5. Doctrine; theory; system of principles:Darwinism.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.