Most frequently refers to the commemoration of the meal that, according to the New Testament, was instituted by Jesus on the night before the Crucifixion. Other terms include Holy Communion, the Lord’s Supper and Eucharist, the Greek word for “thanksgiving.” Eucharist is commonly used by Roman Catholics, Eastern Orthodox Christians and High-Church Anglicans, though some Protestants use it as well.
Belief and practice vary widely. Catholics and Orthodox Christians uniformly see the Eucharist as the central rite of Christian worship, and it is celebrated at least in every Sunday service. Some Protestants also celebrate at least weekly; others do so every other week, monthly, quarterly or less frequently. Catholics and the Orthodox, as well as some Anglicans, believe that the consecrated bread and wine themselves become the body and blood of Christ. They speak of Christ’s “real presence” in the Eucharist. Catholics and other Western Christians refer to this teaching as transubstantiation. Most Orthodox do not use the term because they believe it reflects Western ways of thinking that are foreign to Orthodoxy. Meanwhile, even some Protestants who do not believe in transubstantiation nonetheless speak of Christ’s “real presence.” Many others see the Lord’s Supper as a simple memorial meal in which bread and wine (or grape juice) remain unchanged and are no more than symbols. Do not use the word symbol to refer to the bread or wine unless you are sure that the church you are writing about considers Communion a purely symbolic act. When in doubt, use Communion, a term that has currency in just about every Christian tradition. Mass is the usual Roman Catholic term for a Eucharistic service. Eastern Catholics and the Orthodox typically speak of the Divine Liturgy. Some Protestant churches do not use the term sacrament and may rather refer to the Lord’s Supper (as well as baptism) as an ordinance.
Communion also can refer to a grouping of churches that share the same beliefs and practices, as in the Anglican Communion. For this usage, capitalize on first reference as part of the full name, but lowercase the word when used alone on subsequent references.
Lowercase the phrase communion of saints.