The Collaborative International Dictionary
Excommunicate \Ex`com*mu"ni*cate\, v. t. [imp. & p. p. Excommunicated; p. pr. & vb. n. Excommunicating.]
To put out of communion; especially, to cut off, or shut out, from communion with the church, by an ecclesiastical sentence.
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To lay under the ban of the church; to interdict.
Martin the Fifth . . . was the first that excommunicated the reading of heretical books.
--Miltin.
Wiktionary
vb. (present participle of excommunicate English)
Usage examples of "excommunicating".
Some Bishop Nikon introduced the changes as well as the western manners that were becoming popular in Russian court life at the time, and the bishop started excommunicating anyone who rebelled against these changes.
He'd heard a story about one of the medieval popes getting angry at a comet and excommunicating it.
Boniface then determined to destroy the Colonnesi, and, besides excommunicating, endeavored to direct the weapons of the church against them.