Eucharist - A Christian sacrament in which bread and wine are consecrated, distributed, and consumed in commemoration of the passion and death of Christ.

The principal act of worship on Sundays and other Feasts (see Mass, Lord's Supper, Liturgy, The Holy Communion); a "good gift" or thanksgiving; the current usage in the Episcopal Church to refer to communion or the Lord's Supper. (St Pauls)

A Greek word meaning literally, Thanksgiving , used since the early centuries of the church to describe the primary worship of Christians, also known as Holy Communion.(St James)

The Eucharist in Christianity is one of the sacraments, the sacrament of Holy Communion. It is a the Christian service 'consecrating' or making sacred the Bread and Wine, as Jesus did for his disciples at the Last Supper. The Eucharist is also referred to as the Mass.