Source : Webster's Revised Unabridged Dictionary (1913)

Comer \Com"er\, n.
   One who comes, or who has come; one who has arrived, and is
   present.

   {All comers}, all who come, or offer, to take part in a
      matter, especially in a contest or controversy. ``To prove
      it against all comers.'' --Bp. Stillingfleet.

Source : WordNet®

comer
     n 1: someone with a promising future
     2: someone who arrives (or has arrived) [syn: {arrival}, {arriver}]