a-one

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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World English Dictionary
A1, A-1 or A-one (ˈeɪˈwʌn)
 
adj
1.  in good health; physically fit
2.  informal first class; excellent
3.  (of a vessel) with hull and equipment in first-class condition
 
A-1, A-1 or A-one
 
adj
 
A-one, A-1 or A-one
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Abbreviations & Acronyms
A-one
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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American Heritage
Idioms & Phrases

A-one

Also, A-1; ; A-number-one. First-class, of the best quality, as in This is an A-one steak. The term comes from Lloyd's, the British insurance company, which in its 1775 shipping register designated the condition of a ship's hull by a letter grade (A, B, etc.) and of its cables, anchor, and other equipment by a number grade (1, 2, etc.). By the early 1800s A-1, the best possible grade, was being transferred to anything of superior quality.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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