• synonyms


[suhp-uh-zish-uh n]
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  1. the act of supposing.
  2. something that is supposed; assumption; hypothesis.
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Origin of supposition

1400–50; late Middle English < Latin suppositiōn- (stem of suppositiō) substitution (E meaning by association with suppose), equivalent to supposit(us) (past participle of suppōnere to substitute) + -iōn- -ion. See sup-, position
Related formssup·po·si·tion·al, adjectivesup·po·si·tion·al·ly, adverbnon·sup·po·si·tion·al, adjectivenon·sup·po·si·tion·al·ly, adverbun·sup·po·si·tion·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for supposition

presumption, conjecture, hunch, hypothesis, thesis, guesswork, theory, doubt, postulate, idea, presupposition, postulation, assumption, suspicion, premise, posit, opinion, speculation, view, likelihood

Examples from the Web for supposition

Contemporary Examples of supposition

Historical Examples of supposition

British Dictionary definitions for supposition


  1. the act of supposing
  2. a fact, theory, etc, that is supposed
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Derived Formssuppositional, adjectivesuppositionally, adverbsuppositionless, adjective
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 supposition


early 15c., a term in logic, from Late Latin suppositionem (nominative suppositio) "assumption, hypothesis," noun of action from past participle stem of supponere (see suppose); influenced by Greek hypothesis.

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Online Etymology Dictionary, © 2010 Douglas Harper