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[suhp-uh-zish-uh n] /ˌsʌp əˈzɪʃ ən/
the act of supposing.
something that is supposed; assumption; hypothesis.
Origin of supposition
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. 2017.
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Examples from the Web for supposition
Contemporary Examples
Historical Examples
  • It was only the supposition of Furness, and it is my conviction that they have not.

    The Poacher Frederick Marryat
  • He seemed to yield to the justice of this supposition in spite of himself.

    A Christmas Carol Charles Dickens
  • On any other supposition to the general reader it is unintelligible.

  • Her strange question seemed to be explained by this supposition.

  • It will not do, I suppose, to admit such a supposition; yet the marvels which come constantly before me may almost justify it.

  • "It is pleasant to have your supposition confirmed," Deck ventured to remark.

  • The supposition that she had died of spontaneous combustion was also entertained by a good many.

    Historic Oddities Sabine Baring-Gould
  • On the supposition that the slaves of Besançon were aboard, my heart felt relieved.

    The Quadroon Mayne Reid
  • It is based upon the supposition that your allegations would be supported by evidence.

    The Grafters Francis Lynde
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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