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Definition of conjecture noun from the Oxford Advanced Learner's Dictionary

conjecture

noun
 
/kənˈdʒektʃə(r)/
 
/kənˈdʒektʃər/
(formal)
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  1. [countable] an opinion or idea that is not based on definite knowledge and is formed by guessing synonym guess
    • The truth of his conjecture was confirmed by the newspaper report.
    Topics Opinion and argumentc2, Doubt, guessing and certaintyc2
    Oxford Collocations Dictionaryadjective
    • pure
    • just
    • mere
    preposition
    • conjecture about
    • conjecture as to
    phrases
    • a matter for conjecture
    • open to conjecture
    See full entry
  2. [uncountable] the act of forming an opinion or idea that is not based on definite knowledge
    • What was going through the killer's mind is a matter for conjecture.
    see also guessworkTopics Opinion and argumentc2
    Oxford Collocations Dictionaryadjective
    • pure
    • just
    • mere
    preposition
    • conjecture about
    • conjecture as to
    phrases
    • a matter for conjecture
    • open to conjecture
    See full entry
  3. Word Originlate Middle English (in the senses ‘to divine’ and ‘divination’): from Old French, or from Latin conjectura, from conicere ‘put together in thought’, from con- ‘together’ + jacere ‘throw’.
See conjecture in the Oxford Advanced American Dictionary

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