conjecture (subs.) Copy link Outline 1. conjectūra (of opinion formed on probable grounds)2. ŏpīnātio • conjecture (subs.): 1. conjectūra (of opinion formed on probable grounds): to form a c. (draw a probable conclusion), c. facere, capere, Cic.: Ter. 2. ŏpīnātio: Cic. (But neither of these words is precisely equiv. to the English: v. inference.) Phr.: to form a c., conjecto, 1: = conjecturam facere: augŭror, 1: v. foll. art.