The Collaborative International Dictionary of English v.0.48:
Antiphon \An"ti*phon\, n. [LL. antiphona, fr. Gr. ?. See Anthem.] 1. A musical response; alternate singing or chanting. See Antiphony, and Antiphone. [1913 Webster] 2. A verse said before and after the psalms. --Shipley. [1913 Webster]WordNet (r) 3.0 (2006):
antiphon n 1: a verse or song to be chanted or sung in response [syn: antiphon, antiphony]