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The Collaborative International Dictionary
Postcommunion

Postcommunion \Post`com*mun"ion\, n. [Pref. post- + communion.]

  1. (Ch. of Eng. & Prot. Epis. Ch.) The concluding portion of the communion service.

  2. (R. C. Ch.) A prayer or prayers which the priest says at Mass, after the ablutions.

Wiktionary
postcommunion

n. 1 The concluding portion of the communion service. 2 (context Roman Catholicism English) A prayer or prayers which the priest says at Mass, after the ablutions.

Wikipedia
Postcommunion

Postcommunion ( Latin: Postcommunio) is the text said or sung on a reciting tone following the Communion of the Mass.