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OK (also written as O.K., okay, or okeh) is an American English expression that has become globally recognized to indicate approval, acceptance, agreement, assent, or acknowledgment. It is widely used in both spoken and written language. The expression can function as different parts of speech in English, including an adjective ("He is O.K."), a noun ("He got my O.K."), an adverb ("He finished the job O.K."), and a verb ("He O.K.'d my plan"). Etymology and Historical Development The origin of OK