antiphon (n.) Look up antiphon at Dictionary.com
c. 1500, "a versicle sung responsively," from Middle French antiphone "hymn" or directly from Medieval Latin antiphona, from Greek antiphona, from anti "against, opposite, instead of" (see anti-) + phone "voice," from PIE root *bha- (2) "to speak, tell, say" (see fame (n.)). A re-adoption of the word which had become anthem in English and lost its original meaning.