The Collaborative International Dictionary of English v.0.48:
Pas \Pas\, n. [F. See Pace.] 1. A pace; a step, as in a dance. --Chaucer. [1913 Webster] 2. Right of going foremost; precedence. --Arbuthnot. [1913 Webster]WordNet (r) 3.0 (2006):
pas n 1: (ballet) a step in dancing (especially in classical ballet)