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tr.v. ex·com·mu·ni·cat·ed, ex·com·mu·ni·cat·ing, ex·com·mu·ni·cates
1. To deprive of the right of church membership by ecclesiastical authority.
2. To exclude by or as if by decree from membership or participation in a group.
n. (-kĭt)
A person who has been excommunicated.
adj. (-kĭt, -kāt′)
Having been excommunicated.

[Middle English excommunicaten, from Late Latin excommūnicāre, excommūnicāt- : Latin ex-, ex- + Latin commūnicāre, to share (from commūnis, common; see common).]

ex′com·mu′ni·ca′tive (-kā′tĭv, -kə-), ex′com·mu′ni·ca·to′ry (-kə-tôr′ē) adj.
ex′com·mu′ni·ca′tor n.