Definition - O.K.

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O.K.

an endorsement; "they gave us the O.K. to go ahead"
give sanction to; "I approve of his educational policies"
being satisfactory or in satisfactory condition; "an all-right movie"; "the passengers were shaken up but are all right"; "is everything all right?"; "everything''s fine"; "things are okay"; "dinner and the movies had been fine"; "another minute I''d have
in a satisfactory or adequate manner; "she''ll do okay on her own"; "held up all right under pressure"; (`alright'' is a nonstandard variant of `all right'')