Eucharist

n. Christian ceremony commemorating the last supper of Jesus and his disciples, sacrament of the Lord's Supper, Communion

The Eucharist (also known as Holy Communion, the Lord's Supper, among other names) is a rite or act of worship that most Christians perform in order to fulfill the instruction that they believe Jesus gave his disciples, at his last meal with them before being turned over to his executioners, to do "in remembrance of him" certain actions that he did at that meal.
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Noun
1. a Christian sacrament commemorating the Last Supper by consecrating bread and wine
(synonym) Holy Eucharist, sacrament of the Eucharist, Holy Sacrament, Liturgy, Eucharistic liturgy, Lord's Supper
(hypernym) sacrament
(part-meronym) Offertory

(n.)
The sacrament of the Lord's Supper; the solemn act of ceremony of commemorating the death of Christ, in the use of bread and wine, as the appointed emblems; the communion.
  

(n.)
The act of giving thanks; thanksgiving.
  

Eucharist [from Greek eucharistia thanksgiving] Adopted in the early centuries of the Christian era for the Sacrament of the Lord's Supper, because of the thanksgiving offered over the sacred elements; also applied to the elements themselves. Thus the original meaning, a manifestation of the spirit or inner god in the soul of the neophyte or adept, became degraded into a mere ceremonial rite, itself based on the ceremony of the Bacchic participation of wine and bread -- wine signifying the spirit and bread the manifested body of the spirit in matter. See also BREAD AND WINE