A leader; a chief; a prince.
- A nobleman with the highest hereditary rank, especially a man of the highest grade of the peerage in Great Britain.
- A sovereign prince who rules an independent duchy in some European countries.
- Used as the title for such a nobleman.
- Slang A fist. Often used in the plural: Put up your dukes!
- Botany A type of cherry intermediate between a sweet and a sour cherry.
- To fight, especially with fists: duking it out.