What's the difference between desponsory and responsory?

Desponsory

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Definition:

• (n.) A written pledge of marriage.

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Responsory

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Definition:

• (a.) Containing or making answer; answering.
• (n.) The answer of the people to the priest in alternate speaking, in church service.
• (n.) A versicle sung in answer to the priest, or as a refrain.
• (n.) An antiphonary; a response book.

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