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Contemporary Examples

a1: Joshua, I think the most honest answer I can give to this two-part question is: Yes.
Justin Bieber’s Spiritual Crisis Joshua DuBois January 25, 2014

a1 was too sci-fi, A4 not dramatic enough, so I could simply terminate these threads.
A Mathematically Impossible Novel: Manil Suri Explains “The City of Devi” Manil Suri March 14, 2013

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.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 Various

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!
The Cruise of the “Lively Bee” John De Morgan

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

adjective
in good health; physically fit
(informal) first class; excellent
(of a vessel) with hull and equipment in first-class condition

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).

adjective

a-number-1
language
Address 1 code.
An a1 code interpreter, by Matthew Newhook [email protected] was used to test compiler output. It requires gcc 2.4.2 or higher and is portable to computers with memory segment protection.
(ftp://ftp.cs.mun.ca/pub/a1).
(1994-07-19)
first class (excellent)