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.