1. A nobleman with the highest hereditary rank, especially a man of the highest grade of the peerage in Great Britain.
2. A sovereign prince who rules an independent duchy in some European countries.
3. Used as the title for such a nobleman.
4. dukes Slang The fists: Put up your dukes!
5. Botany A type of cherry intermediate between a sweet and a sour cherry.
To fight, especially with fists: duking it out.