- 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.
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- 2[uncountable] the forming of an opinion or idea that is not based on definite knowledge synonym guess What was going through the killer's mind is a matter for conjecture.
NAmE//kənˈdʒɛktʃərəl//
adjective Some of the stages of the Earth's development are purely conjectural.See conjecture in the Oxford Advanced Learner's DictionaryCheck pronunciation: conjecture