To Perceive or understand as being fact or truth; have a clear or distinct perception or apprehension of; understand or comprehend clearly and fully; be conscious of perceiving truly.In a general sense, to have definite information or intelligence about; be acquainted with, either through the report of others or through personal ascertainment, observation, experience, or intercourse: as, to know American history; he knows the city thoroughly.To recognize after some absence or change; recall to the mind or perception; revive prior knowledge of: as, he was so changed that you would hardly know him.To recognize in contrast or comparison; distinguish by means of previous acquaintance or information: as, to know one man from another; we know a fixed star from a planet by its twinkling; to know the right way.To understand from experience or attainment; comprehend as to manner or method: with how before an infinitive: as, to know how to make something.To have sexual commerce with. Gen. iv. 1. [A euphemism.]To possess knowledge; be informed; have intelligence.To take cognizance; acquire knowledge; get intelligence.To be acquainted with each other. You and I have known, sir.n. Knowledge.n. A dialectal (Scotch) form of knolln. Middle English forms of knee.