"Excommunicate this user? Yes/No" ex·com·mu·ni·cate (ĕks'kə-myū'nĭ-kāt') pronunciation tr.v., -cat·ed, -cat·ing, -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. ???????????