(1):

(v. t.) To solve by a correct conjecture; to conjecture rightly; as, he who guesses the riddle shall have the ring; he has guessed my designs.

(2):

(v. t.) To form an opinion concerning, without knowledge or means of knowledge; to judge of at random; to conjecture.

(3):

(v. i.) To make a guess or random judgment; to conjecture; - with at, about, etc.

(4):

(v. t.) To think; to suppose; to believe; to imagine; - followed by an objective clause.

(5):

(v. t.) To hit upon or reproduce by memory.

(6):

(n.) 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.

(7):

(v. t.) To judge or form an opinion of, from reasons that seem preponderating, but are not decisive.