A small crown, usually worn by a person of noble rank below the highest ranks, or a crown-shaped ornamental band.
From Old French coronete, a diminutive of corona (crown), formed with the -et suffix meaning 'little,' so literally a 'little crown.'
Coronets are the intelligence test of royal crowns—a full crown means you're the sovereign, but a coronet says 'I'm nobility but not THE ruler,' so rank is literally written on your head!
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