conjecture UK /kənˈd͡ʒɛkt͡ʃə/US /kənˈd͡ʒɛkt͡ʃɚ/noun 4verb 2forms 4 noun4 •A statement likely to be true based on available evidence, but which has not been formally proven. •(formal) A statement or an idea which is unproven, but is thought to be true; a guess.I explained it, but it is pure conjecture whether he understood, or not. •(formal) A supposition based upon incomplete evidence; a hypothesis.The physicist used his conjecture about subatomic particles to design an experiment. •(no longer used) Interpretation of signs and omens. verb2 •To infer on slight evidence; to guess at.February 22, 1685, Robert South, All Contingences under the Direction of God's Providence (sermon preached at Westminster Abbey) •(formal) To guess; to venture an unproven idea.I do not know if it is true; I am simply conjecturing here. formsconjectured · conjecturing · conjectures · conjectureth