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1. Opinion or judgment based on inconclusive or incomplete evidence; guesswork.
2. An opinion or conclusion based on guesswork: The commentators made various conjectures about the outcome of the next election.
v. con·jec·tured, con·jec·tur·ing, con·jec·tures
To judge or conclude by conjecture; guess: "From the comparative silence below ... I conjectured that Mr Rochester was now at liberty" (Charlotte Brontë).
To make a conjecture.
[Middle English, from Old French, from Latin coniectūra, from coniectus, past participle of conicere, to infer : com-, com- + iacere, to throw; see yē- in Indo-European roots.]