WordReference Random House Learner's Dictionary of American English © 2019
A-1 or A 1/ˈeɪˈwʌn/USA pronunciation   adj. 
  1. A one.

WordReference Random House Unabridged Dictionary of American English © 2019
A-1  wun),USA pronunciation adj. 
  1. See  A one. 
Also,  A 1 
Collins Concise English Dictionary © HarperCollins Publishers::
A1, A-1, 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
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