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di·a·dem n. 1. A crown worn as a sign of royalty. 2. Royal power or dignity. tr.v. di·a·demed, di·a·dem·ing, di·a·dems Middle English diademe, from Old French, from Latin diadma, from Greek, band, from diadein, to bind around : dia-, dia- + dein, d-, to bind.
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