a 1

A-1

[ey-wuhn]
adjective
Also, A 1.
Dictionary.com Unabridged

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. 2014.
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Etymonline
Word Origin & History

A-1
in figurative sense of "first-rate," 1837, in Dickens; from Lloyd's of London designation for ships in first-class condition (with the letter referring to the condition of the ship and the number to that of the stores).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
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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