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A-1

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A-1

[ey-wuhn]
–adjective
A one.
Also, A 1

A one

[ey wuhn]
–adjective
1. noting a vessel regarded by a shipping-classification society as being equipped to the highest standard and with equipment maintained in first-class condition.
2. Also, A number one. Informal. first-class; excellent; superior: The meals there are A one.
Also, A-one, A 1, A-1


Origin:
1830–40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To A-1
A-one also A-1   (ā'wŭn')
adj.   Informal
First-class; excellent.

[From classification for ships in The Lloyd's Register of Shipping.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Slang Dictionary
A-1

and A number 1
  1. mod.
    of the highest rating. : This steak is really A-1!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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Word Origin & History

A-1 
in figurative sense of "first-rate," 1837, is from Lloyd's of London designation for ships in first-class condition.
Online Etymology Dictionary, © 2001 Douglas Harper
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Abbreviations & Acronyms
A-1
first class (excellent)
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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