early 12c., from Anglo-French cuncile, from Old North French concilie (Old French concile, 12c.) "assembly; council meeting; body of counsellors," from Latin concilium "a meeting, a gathering of people," from PIE *kal-yo-, suffixed form of root *kele- (2) "to shout." The notion is of a calling together. Tendency to confuse it in form and meaning with counsel has been consistent since 16c.
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