The Collaborative International Dictionary of English v.0.48:
100th \100th\ adj. 1. coming next after the ninety-ninth in a series Syn: hundredth, centesimal [WordNet 1.5 +PJC]WordNet (r) 3.0 (2006):
100th adj 1: the ordinal number of one hundred in counting order [syn: hundredth, centesimal, 100th]