Relating to or expressing excommunication; having the nature or effect of removing someone from religious community participation.
From 'excommunicate' with the adjectival suffix '-ory,' similar to words like 'mandatory' or 'laudatory.' This form emphasizes the character or purpose of something.
The '-atory' ending makes this word sound particularly formal and official, which fits perfectly since excommunication was always a highly formal, ceremonial pronouncement rather than a casual rejection.
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