Definitions from Wiktionary ( )

▸ verb:  (transitive) To perceive the truth or factuality of; to be certain of; to be certain that.
▸ verb:  (intransitive) To be or become aware or cognizant.
▸ verb:  (transitive) To be aware of; to be cognizant of.
▸ verb:  (intransitive, obsolete) To be acquainted (with another person).
▸ verb:  (transitive) To be acquainted or familiar with; to have encountered.
▸ verb:  (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.’
▸ verb:  (transitive) To experience.
▸ verb:  To understand or have a grasp of through experience or study.
▸ verb:  (transitive) To be able to distinguish, to discern, particularly by contrast or comparison; to recognize the nature of.
▸ verb:  (transitive) To recognize as the same (as someone or something previously encountered) after an absence or change.
▸ verb:  (intransitive) To have knowledge; to have information, be informed.
▸ verb:  (transitive) To be able to play or perform (a song or other piece of music).
▸ verb:  (transitive) To have indexed and have information about within one's database.
▸ verb:  (transitive, philosophy) To maintain (a belief, a position) subject to a given philosophical definition of knowledge; to hold a justified true belief.
▸ noun:  (rare) Knowledge; the state of knowing.
▸ noun:  Knowledge; the state of knowing. (Now confined to the fixed phrase in the know.)
▸ noun:  Alternative form of knowe (“hill, knoll”) [(chiefly Scotland and Ulster) A small hill; a knoll.]

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