to form an opinion concerning, without knowledge or means of knowledge; to judge of at random; to conjecture.-to judge or form an opinion of, from reasons that seem preponderating, but are not decisive.-to solve by a correct conjecture; to conjecture rightly; as, he who guesses the riddle shall have the ring; he has guessed my designs.-to hit upon or reproduce by memory.-to think; to suppose; to believe; to imagine; --  followed by an objective clause.-to make a guess or random judgment; to conjecture; -- with at, about, etc.-an opinion as to anything, formed without sufficient or decisive evidence or grounds; an attempt to hit upon the truth by a random judgment; a conjecture; a surmise.