Easton's 1897 Bible Dictionary:

Lord's Supper
   (1 Cor. 11:20), called also "the Lord's table" (10:21),
   "communion," "cup of blessing" (10:16), and "breaking of bread"
   (Acts 2:42).

     In the early Church it was called also "eucharist," or giving
   of thanks (comp. Matt. 26:27), and generally by the Latin Church
   "mass," a name derived from the formula of dismission, Ite,
   missa est, i.e., "Go, it is discharged."

     The account of the institution of this ordinance is given in
   Matt. 26:26-29, Mark 14:22-25, Luke 22:19, 20, and 1 Cor.
   11:24-26. It is not mentioned by John.

     It was designed, (1.) To commemorate the death of Christ:
   "This do in remembrance of me." (2.) To signify, seal, and apply
   to believers all the benefits of the new covenant. In this
   ordinance Christ ratifies his promises to his people, and they
   on their part solemnly consecrate themselves to him and to his
   entire service. (3.) To be a badge of the Christian profession.
   (4.) To indicate and to promote the communion of believers with
   Christ. (5.) To represent the mutual communion of believers with
   each other.

     The elements used to represent Christ's body and blood are
   bread and wine. The kind of bread, whether leavened or
   unleavened, is not specified. Christ used unleavened bread
   simply because it was at that moment on the paschal table. Wine,
   and no other liquid, is to be used (Matt. 26:26-29). Believers
   "feed" on Christ's body and blood, (1) not with the mouth in any
   manner, but (2) by the soul alone, and (3) by faith, which is
   the mouth or hand of the soul. This they do (4) by the power of
   the Holy Ghost. This "feeding" on Christ, however, takes place
   not in the Lord's Supper alone, but whenever faith in him is
   exercised.

     This is a permanent ordinance in the Church of Christ, and is
   to be observed "till he come" again.