Relating to or appropriate to a church; having the character of being connected with religious worship or ecclesiastical affairs.
From church (from Old English circe, from Greek kyriakon 'of the Lord') + -ly (Old English -lic, meaning 'of, relating to, or having the nature of').
The word 'church' itself shows English's deep borrowing history—it came through Greek (kyriakon) to Old English as a religious term, while secular buildings use Germanic roots (hus→house), revealing which words invaded from which cultures.
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