antiphonal
noun
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A book of antiphons or anthems sung or chanted at a liturgy; an antiphonary or antiphoner.
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An antiphon; a piece sung or chanted in an antiphonal manner.
Synonyms:
antiphonar, antiphonary, antiphoner
adjective
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Characterized by antiphones or antiphony; incorporating alternate, or responsive singing by a choir split into two parts.
"The antiphonal hymn was sung regularly at church."