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English definition of “conjecture”

conjecture

noun [C or U] uk   /kənˈdʒek.tʃər/ us    /-tʃɚ/
a guess about something based on how it seems and not on proof: There's been a lot of conjecture in the papers recently about the marriage.

conjecture

verb [I] uk   /kənˈdʒek.tʃər/ us    /-tʃɚ/ formal
to guess, based on the appearance of a situation and not on proof: We'll never know exactly how she died; we can only conjecture. [+ that] He conjectured that the company would soon be in financial difficulties.
conjectural
adjective uk   /-əl/ us  
(Definition of conjecture from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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