communion

Short definition from Wiktionary

Noun

1. 1
   A joining together of minds or spirits; a mental connection.
2. 2
   Holy Communion; the Eucharist.
3. 3
   Ecclesiastical interrecognition of belonging to the true Church: A form of ecclesiastical unity between the Roman Catholic Church and another, so that the latter is considered part of the former.
4. 4
   Ecclesiastical interrecognition of belonging to the true Church: A denomination; a high-level organised subgrouping of Christianity (now especially in Anglican Communion)

Proper noun

1. 1
   Alternative letter-case form of communion (“Holy Communion”).