supposition

[suhp-uh-zish-uh n]
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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
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British Dictionary definitions for supposition

supposition

noun
  1. the act of supposing
  2. 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
n.

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