1st

from WordNet (r) 3.0 (2006)

1st
    adj 1: indicating the beginning unit in a series [syn: {first},
           {1st}]

from The Collaborative International Dictionary of English v.0.48

1st \1st\ adj.
   1. preceding all other objects or events in order, time, or
      importance; occurring before all other members of a
      series.

   Syn: first
        [WordNet 1.5 +PJC]