0 When the Christian Church, especially the Roman Catholic Church, excommunicates someone, it refuses to give that person communion and does not allow them to be involved in the Church.
1 (of the Christian Church, esp. the Roman Catholic Church) to refuse to allow someone to be a member of the church
A man whom the Church had excommunicated was buried in the cemetery of a German convent.
I expect one would be immediately excommunicated as a heretic.
They duly excommunicated each other, and the Latin Church was rent in twain.
