v (transitive) To perceive the truth or factuality of; to be certain of or that; to correctly believe with justified confidence via reliable methods.
v (intransitive) To be or become aware or cognizant.
v (transitive) To be aware of; to be cognizant of.
v (intransitive, obsolete) To be acquainted (with another person).
v (transitive) To be acquainted or familiar with; to have encountered.
v (transitive, archaic, biblical, euphemistic) To have sexual relations with. This meaning normally specified in modern English as e.g. to ’know someone in the biblical sense’ or to ‘know biblically.’
v (transitive) To experience.
v To understand or have a grasp of through experience or study.
v (transitive) To be able to distinguish, to discern, particularly by contrast or comparison; to recognize the nature of.
v (transitive) To recognize as the same (as someone or something previously encountered) after an absence or change.
v (intransitive) To have knowledge; to have information, be informed.
v (transitive) To be able to play or perform (a song or other piece of music).
v (transitive) To have indexed and have information about within one's database.
n (rare) Knowledge; the state of knowing.
n Knowledge; the state of knowing. (Now confined to the fixed phrase in the know.)
n Alternative form of knowe (“hill, knoll”) [(chiefly Scotland and Ulster) A small hill; a knoll.]