What's the difference between antiphonary and antiphony?

Antiphonary

Definition:

• (n.) A book containing a collection of antiphons; the book in which the antiphons of the breviary, with their musical notes, are contained.

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Antiphony

Definition:

• (n.) A musical response; also, antiphonal chanting or signing.
• (n.) An anthem or psalm sung alternately by a choir or congregation divided into two parts. Also figuratively.

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