The Collaborative International Dictionary of English v.0.48:
12th \12th\ adj. 1. coming next after the eleventh in a series Syn: twelfth [WordNet 1.5 +PJC]WordNet (r) 3.0 (2006):
12th adj 1: coming next after the eleventh and just before the thirteenth in position [syn: twelfth, 12th]