[ suhp-uh-zish-uh n ]
/ ˌsʌp əˈzɪʃ ən /


the act of supposing.
something that is supposed; assumption; hypothesis.

Nearby words

  1. suppose,
  2. supposed,
  3. supposed to,
  4. supposedly,
  5. supposing,
  6. suppositious,
  7. supposititious,
  8. suppositive,
  9. suppository,
  10. suppress

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 forms Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for supposition

British Dictionary definitions for supposition


/ (ˌsʌpəˈzɪʃən) /


the act of supposing
a fact, theory, etc, that is supposed
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.

Online Etymology Dictionary, © 2010 Douglas Harper