Definition of post-communion in US English:

post-communion

noun

Christian Church
  • The prayer uttered by the presiding minister following the administration of the Eucharist; that part of the liturgy which completes the celebration after the administration of the Eucharist.

adjective

Christian Church
  • Following the administration of the Eucharist, especially delivered or spoken after the Eucharist.

Origin

Late Middle English. From Middle French, French postcommunion and its etymon post-classical Latin postcommunion-, postcommunio from classical Latin post- + commūnio.

Pronunciation

post-communion

/ˌpəʊs(t)kəˈmjuːnɪən/