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A one

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


or A 1

[ey-wuhn] /ˈeɪˈwʌn/
1. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for a1
Contemporary Examples
Historical Examples
  • a1, sir; far finer vessel—couple of hundred tons larger—and sails faster.'

    The Green Hand George Cupples
  • An a1 piece of villainy was on, and they were conversing in low tones.

    Thoroughbreds W. A. Fraser
  • But a1 is the area of the second figure F1, which is proportional to the reading of W1.

  • a1, first-rate, the very best; shes a prime girl, she is; she is a1.

    The Slang Dictionary John Camden Hotten
  • Why, youll be a1 material for next—if you keep your head up.

    Full-Back Foster Ralph Henry Barbour
  • But you should see his wife; she's a stunner—a1 anywhere; she is a beauty!

  • Each in his day made the best of the mechanical appliances at his disposal, and was a1 in style for their use.

    Boating W. B. Woodgate
  • Analysis has become for you an a1 example of the phrase-maker's art.

    The Knack of Managing Lewis K. Urquhart and Herbert Watson
British Dictionary definitions for a1


in good health; physically fit
(informal) first class; excellent
(of a vessel) with hull and equipment in first-class condition
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for a1


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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Slang definitions & phrases for a1




The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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a1 in Technology
Address 1 code.
An a1 code interpreter, by Matthew Newhook was used to test compiler output. It requires gcc 2.4.2 or higher and is portable to computers with memory segment protection.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Related Abbreviations for a1


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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