Superlative form of churchly; most appropriate to or characteristic of a church or religious setting.
From churchly + -est (the superlative suffix). The -est suffix comes from Old English and is the most ancient superlative marker in Germanic languages.
Superlatives in English have stayed remarkably stable for over a thousand years—Old English speakers used -est just like we do, making it one of the most conservative grammatical features despite English's massive vocabulary changes.
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