A one

[ey wuhn]


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

First recorded in 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for a1

Contemporary Examples of a1

Historical Examples of a1

  • An A1 piece of villainy was on, and they were conversing in low tones.


    W. A. Fraser

  • One instance each of A-1 and A1, and cooee and coo-e-e were retained.

  • I've got some A1 inventions here, an' I want to get 'em patented.

    The Panchronicon

    Harold Steele Mackaye

  • When at rest they all press upwards against the plates A and A1 respectively.

    How it Works

    Archibald Williams

  • Mrs. Bax, now that her true nature was revealed, proved to be A1.

    New Treasure Seekers

    E. (Edith) Nesbit

British Dictionary definitions for a1


A-1 or A-one


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