1) Communion 2) Holy communion 3) Manduction 4) Sacramental manduction 
The agreement or practice of two Ecclesial communities by which each admits members of the other communion to its sacraments.
• (n.) Mutual communion; as, an intercommunion of deities.
In`ter·com·mun'ion noun Mutual communion; as, an intercommunion of deities. Faber. 
The agreement or practice of two Ecclesial communities by which each admits members of the other communion to its sacraments.
[n] - participation in Holy Communion by members of more than one church (eg Catholic and Orthodox)
noun participation in Holy Communion by members of more than one church (eg Catholic and Orthodox)
mutual communion, association, or relations. · a communion service among members of different denominations. Cf. close communion, open communion.