n. Participation in something, especially in ideas and sentiments held in common; hence, fellowship; concord; association.n. Intercourse between two or more persons; interchange of thoughts or interests; communication.n. Union in religious worship, or in doctrine and discipline; religious fellowship: as, members in full communion.n. A body of Christians who have one common faith, but not necessarily ecclesiastical union; a religious denomination.n. The act of partaking of the sacrament of the eucharist; the celebration of the Lord's supper; also, the elements of the eucharist.n. Common action; common consent; public act.