A movement, philosophy, or attitude that opposes church authority and the influence of religious institutions in society.
From antiecclesiastical + -ism (forming abstract nouns for beliefs/movements). The -ism suffix creates a noun describing a whole system of thought or political position.
Antiecclesiasticism became a major intellectual force in Europe—entire governments rewrote laws to limit church power, and this one word captured centuries of conflict between state and religion.
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