A-OK

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A-OK

Operating or existing in perfect working order or in the best condition to be hoped for. Primarily heard in US. We've got the new engine fitted to the car now, and so far it's running A-OK! I've felt A-OK since I left the hospital last week.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

A-OK

mod. in the best of condition. I really feel A-OK.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.

A-OK

Excellent. The term dates from a specific incident in 1961, when the National Aeronautics and Space Administration’s Colonel “Shorty” Power misunderstood astronaut Alan Shepard’s “OK” for “A-OK,” indicating that his suborbital flight was going well. The term caught on, along with other space-flight terms that entered the language about the same time.
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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