"alternate or responsive singing," 1590s, from antiphon + -y (1).
Entries linking to antiphony
antiphon n.
c. 1500, "a versicle sung responsively," from French antiphone "hymn" or directly from Medieval Latin antiphona, from Greek antiphōna (neuter plural), from antiphōnos "responsive, sounding in answer," from anti "in return" (see anti-) + phōnē "voice" (from PIE root *bha- (2) "to speak, tell, say").
A reborrowing of the word which had become anthem in English (in Old English antefn, antifon) and lost its original meaning.
-y 1
noun suffix, in army, city, country, etc., from Old French -e, Latin -atus, -atum, past participle suffix of certain verbs, which in French came to be used to indicate "employment, office, dignity" (as in duché, clergié).