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See more synonyms for conjecture on Thesaurus.com
  1. the formation or expression of an opinion or theory without sufficient evidence for proof.
  2. an opinion or theory so formed or expressed; guess; speculation.
  3. Obsolete. the interpretation of signs or omens.
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verb (used with object), con·jec·tured, con·jec·tur·ing.
  1. to conclude or suppose from grounds or evidence insufficient to ensure reliability.
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verb (used without object), con·jec·tured, con·jec·tur·ing.
  1. to form conjectures.
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Origin of conjecture

1350–1400; (noun) Middle English < Latin conjectūra (< Middle French) inferring, reasoning, equivalent to conject(us) past participle of conjicere to throw together, form a conclusion (con- con- + -jicere, combining form of jacere to throw) + -ūra -ure; (v.) late Middle English conjecturen (< Middle French) < Late Latin conjecturāre, derivative of the noun
Related formscon·jec·tur·a·ble, adjectivecon·jec·tur·a·bly, adverbcon·jec·tur·er, nounmis·con·jec·ture, verb, mis·con·jec·tured, mis·con·jec·tur·ing; nounnon·con·jec·tur·a·ble, adjectivenon·con·jec·tur·a·bly, adverbpre·con·jec·ture, verb (used with object), pre·con·jec·tured, pre·con·jec·tur·ing.un·con·jec·tur·a·ble, adjectiveun·con·jec·tured, adjective

Synonyms for conjecture

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for conjecturing

gather, figure, conclude, feel, fancy, deem, expect, surmise, guess, glean, hypothesize, suspect, infer, presume, imagine, judge, estimate, believe, theorize, assume

Examples from the Web for conjecturing

Historical Examples of conjecturing

  • The Squire had little trouble in conjecturing, however, that Ben was at the bottom of it.

    Paul Prescott's Charge

    Horatio Alger

  • To what use it will next be put I have no pleasure in conjecturing.

  • But no needless time was spent in surmises and conjecturing.

  • We must fall back upon history, and then go to conjecturing.

    In Defense of Harriet Shelley

    Mark Twain (Samuel Clemens)

  • After I had spent nearly half an hour in this sort of conjecturing.

    The Boy Tar

    Mayne Reid

British Dictionary definitions for conjecturing


  1. the formation of conclusions from incomplete evidence; guess
  2. the inference or conclusion so formed
  3. obsolete interpretation of occult signs
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  1. to infer or arrive at (an opinion, conclusion, etc) from incomplete evidence
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Derived Formsconjecturable, adjectiveconjecturably, adverbconjecturer, noun

Word Origin for conjecture

C14: from Latin conjectūra an assembling of facts, from conjicere to throw together, from jacere to throw
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 conjecturing



late 14c., "interpretation of signs and omens," from Old French conjecture "surmise, guess," or directly from Latin coniectura "conclusion, interpretation, guess, inference," literally "a casting together (of facts, etc.)," from coniectus, past participle of conicere "to throw together," from com- "together" (see com-) + iacere "to throw" (see jet (v.)). Sense of "forming of opinion without proof" is 1530s.

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early 15c., from conjecture (n.). In Middle English also with a parallel conjecte (n.), conjecten (v.). Related: Conjectured; conjecturing.

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Online Etymology Dictionary, © 2010 Douglas Harper