The Collaborative International Dictionary
Responsory \Re*spon"so*ry\ (r?*sp?n"s?*r?), a.
Containing or making answer; answering.
--Johnson.
Responsory \Re*spon"so*ry\, n.; pl. -ries (-r?z). [LL. responsorium.]
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(Eccl.)
The answer of the people to the priest in alternate speaking, in church service.
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A versicle sung in answer to the priest, or as a refrain.
Which, if should repeat again, would turn my answers into responsories, and beget another liturgy.
--Milton.
(Eccl.) An antiphonary; a response book.
Wiktionary
a. Containing or making answer; answering. n. A chant or anthem recited after a reading in a church service
Wikipedia
A responsory or respond is a type of chant in western Christian liturgies.
Usage examples of "responsory".
Old and New Testaments and the homilies of the Fathers, interspersed with Responsories bringing home to the faithful the wonders of the Holy Night.