Antiphonal
Verse-by-verse alternation between groups of singers or readers for the singing or recitation of the Psalter. This alternation may be between choir and congregation, or between one side of the congregation and the other (BCP, p. 582). The term is from the Greek, meaning “voice against voice.”
Glossary definitions provided courtesy of Church Publishing Incorporated, New York, NY,(All Rights reserved) from “An Episcopal Dictionary of the Church, A User Friendly Reference for Episcopalians,” Don S. Armentrout and Robert Boak Slocum, editors.