To place a diadem or crown upon someone's head; to crown.
From French 'endiademer,' combining 'en-' (to cause to be) with 'diadème' (diadem/crown), from Greek 'diadema.' The prefix 'en-' transforms the noun into an action.
French is full of these 'en-' verbs that turn nouns into actions—the same pattern gives us 'enlarge,' 'enable,' and 'endanger,' showing how language borrows the same clever tricks across centuries.
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