Что такое communion? Что такое communion? The act or an instance of sharing, as of thoughts or feelings.Religious or spiritual fellowship.A body of Christians with a common religious faith who practice the same rites; a denomination.Ecclesiastical The sacrament of the Eucharist received by a congregation.Ecclesiastical The consecrated elements of the Eucharist.Ecclesiastical The part of the Mass or a liturgy in which the Eucharist is received.