See more synonyms for assertion on
  1. a positive statement or declaration, often without support or reason: a mere assertion; an unwarranted assertion.
  2. an act of asserting.

Origin of assertion

1375–1425; late Middle English assercion < Latin assertiōn- (stem of assertiō). See assert, -ion
Related formsas·ser·tion·al, adjectivemis·as·ser·tion, nounnon·as·ser·tion, nouno·ver·as·ser·tion, nounre·as·ser·tion, nounsu·per·as·ser·tion, noun

Synonyms for assertion

See more synonyms for on Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for assertion

Contemporary Examples of assertion

Historical Examples of assertion

  • But the older man would not permit the assertion to go uncontradicted.

    Within the Law

    Marvin Dana

  • Her assertion was disregarded as to the inability to change.

    Within the Law

    Marvin Dana

  • He put his whole will into the assertion of guilt, to batter down the man's resistance.

    Within the Law

    Marvin Dana

  • I'm inclined to question, furthermore, the assertion that these jewels were your mother's.

    The Black Bag

    Louis Joseph Vance

  • Donald had killed a man in the assertion of the first law of nature—self-preservation.

British Dictionary definitions for assertion


  1. a positive statement, usually made without an attempt at furnishing evidence
  2. the act of asserting
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 assertion

early 15c., assercioun, from Middle French assertion (14c.) or directly from Late Latin assertionem (nominative assertio), noun of action from past participle stem of Latin asserere "claim rights over something, state, maintain, affirm," from ad- "to" (see ad-) + serere "join" (see series). By "joining oneself" to a particular view, one "claimed" or "maintained" it.

Online Etymology Dictionary, © 2010 Douglas Harper