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Definition of A-OK adjective from the Oxford Advanced Learner's Dictionary

A-OK

adjective
 
/ˌeɪ əʊ ˈkeɪ/
 
/ˌeɪ əʊ ˈkeɪ/
[not before noun] (North American English, informal)
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  1. in good condition; in an acceptable manner
    • Everything's A-OK now.
    Word Origin1960s (originally an astronauts' term): from all systems OK.
See A-OK in the Oxford Advanced American Dictionary

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