Source : Webster's Revised Unabridged Dictionary (1913)

Excommunicate \Ex"com*mu"ni*cate\, a. [L. excommunicatus, p. p.
   of communicare to excommunicate; ex out + communicare. See
   {Communicate}.]
   Excommunicated; interdicted from the rites of the church. --
   n. One excommunicated.

         Thou shalt stand cursed and excommunicate. --Shak.

Excommunicate \Ex`com*mu"ni*cate\, v. t. [imp. & p. p.
   {Excommunicated}; p. pr. & vb. n. {Excommunicating}.]
   1. To put out of communion; especially, to cut off, or shut
      out, from communion with the church, by an ecclesiastical
      sentence.

   2. To lay under the ban of the church; to interdict.

            Martin the Fifth . . . was the first that
            excommunicated the reading of heretical books.
                                                  --Miltin.

Source : WordNet®

excommunicate
     v 1: exclude from a church or a religious community; "The gay
          priest was excommunicated when he married his partner"
          [syn: {curse}] [ant: {communicate}]
     2: oust or exclude from a group or membership by decree