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]WordNet (r) 3.0 (2006):
1st adj 1: indicating the beginning unit in a series [syn: first, 1st]