a 1

1 definition found

a 1 - Collaborative International Dictionary of English v.0.48 :

  A 1 \A 1\ ([=a] w[u^]n).
     A registry mark given by underwriters (as at Lloyd's) to
     ships in first-class condition. Inferior grades are indicated
     by A 2 and A 3.
     [1913 Webster]
  
     Note: A 1 is also applied colloquially to other things to
           imply superiority; prime; first-class; first-rate.
           [1913 Webster]