"antiphonal" in the noun sense
1. antiphonary, antiphonal
bound collection of antiphons
"antiphonal" in the adjective sense
1. responsive, antiphonal
containing or using responses alternating
"responsive reading"
"antiphonal laughter"
2. antiphonary, antiphonal
relating to or resembling an antiphon or antiphony
Source: WordNet® (An amazing lexical database of English)
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