Longman Dictionary of Contemporary English homepage

OK

3 verb
     
OK3 , okay past tense and past participle OK'd, present participle OK'ing, third person singular OK's or, past tense and past participle okayed, present participle okaying, third person singular okays [transitive] informal
to say officially that you will agree to something or allow it to happen:
The plans have been okayed, so let's get started as soon as possible.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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