Source : Webster's Revised Unabridged Dictionary (1913)

Communicant \Com*mu"ni*cant\, n. [L. communicans, p. pr.]
   1. One who partakes of, or is entitled to partake of, the
      sacrament of the Lord's supper; a church member.

            A never-failing monthly communicant.  --Atterbury.

   2. One who communicates. --Foxe.

Communicant \Com*mu"ni*cant\, a.
   Communicating. [R.] --Coleridge.

Source : WordNet®

communicant
     n : a person entitled to receive Communion