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[suhp-uh-zish-uh n] /ˌsʌp əˈzɪʃ ən/
the act of supposing.
something that is supposed; assumption; hypothesis.
late Middle English
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 forms
suppositional, adjective
suppositionally, adverb
nonsuppositional, adjective
nonsuppositionally, adverb
unsuppositional, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for supposition
  • Osborn based this supposition on what he thought was a change in tailbone anatomy about halfway down the organ's length.
  • supposition has been winging its way around movie fandom for weeks leading up to the film's premiere.
  • The second supposition is that all things can compute.
  • One is the supposition that airlines raise rates on the weekends while keeping them low during the week.
  • Courts can't reliably, and in my view shouldn't, work on supposition and rumour but on objective evidence.
  • If nothing of this magnitude could ever appear in their imaginations, why should they believe in this supposition.
  • But to pretend that this is a genetically determined trait is a premature supposition.
  • Finally, the supposition that any major transportation system can be built without substantial collective effort is a fantasy.
  • There is no scientific basis for the underlying supposition.
  • We imagined what might have happened, acted upon the supposition, and find ourselves justified.
British Dictionary definitions for supposition


the act of supposing
a fact, theory, etc, that is supposed
Derived Forms
suppositional, adjective
suppositionally, adverb
suppositionless, 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
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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.

Online Etymology Dictionary, © 2010 Douglas Harper
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