'coronet' originates from Old French 'coronete', a diminutive of 'corone' (crown), ultimately from Latin 'corona' and Greek 'korōnē', where 'corona' meant 'garland, crown'.

'coronet' changed from Old French 'coronete' and Middle English forms into the modern English word 'coronet'.

Initially it meant a small 'garland' or 'crown' (from Latin/Greek), and over time it came to mean the small crown or crown-like structure used as headwear or a heraldic emblem.