Informal. OK; perfect:
an A-OK rocket launching.
(informal, mainly US) in perfect working order; excellent

1961, said to be an abbreviation of all (systems) OK; popularized in the jargon of U.S. astronauts. See OK.


Proceeding or functioning properly; giving no cause for worry; copacetic, go: Your X rays are A-OK


: The plan’s going A-OK (1960s+ Space travel)
in perfect condition or order


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