Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: all (systems) OK

A-OK

 adjective
     
A-OK American English spoken informal
in good condition [= satisfactory]:
We took the car in for a check, and it was A-OK.
—A-OK adverb:
Everything's been going A-OK since Jack got home.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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