[ kuhn-jek-cher ]
See synonyms for: conjectureconjecturedconjecturingconjecturable on

  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.

  1. Obsolete. the interpretation of signs or omens.

verb (used with object),con·jec·tured, con·jec·tur·ing.
  1. to conclude or suppose from grounds or evidence insufficient to ensure reliability.

verb (used without object),con·jec·tured, con·jec·tur·ing.
  1. to form conjectures.

Origin of conjecture

1350–1400; (noun) Middle English from Latin conjectūra (from 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; (verb) late Middle English conjecturen (from Middle French ) from Late Latin conjecturāre, derivative of the noun

synonym study For conjecture

4. See guess.

Other words for conjecture

Other words from conjecture

  • con·jec·tur·a·ble, adjective
  • con·jec·tur·a·bly, adverb
  • con·jec·tur·er, noun
  • mis·con·jec·ture, verb, mis·con·jec·tured, mis·con·jec·tur·ing, noun
  • non·con·jec·tur·a·ble, adjective
  • non·con·jec·tur·a·bly, adverb
  • pre·con·jec·ture, verb (used with object), pre·con·jec·tured, pre·con·jec·tur·ing.
  • un·con·jec·tur·a·ble, adjective
  • un·con·jec·tured, adjective

Words Nearby conjecture Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use conjecture in a sentence

British Dictionary definitions for conjecture


/ (kənˈdʒɛktʃə) /

  1. the formation of conclusions from incomplete evidence; guess

  2. the inference or conclusion so formed

  1. obsolete interpretation of occult signs

  1. to infer or arrive at (an opinion, conclusion, etc) from incomplete evidence

Origin of conjecture

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

Derived forms of conjecture

  • conjecturable, adjective
  • conjecturably, adverb
  • conjecturer, noun

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