The male ruler of a barony.

A male member of the lowest rank of English nobility (the equivalent rank in Scotland is lord).

(by extension) A person of great power in society, especially in business and politics.

(UK, prison slang) A prisoner who gains power and influence by lending or selling goods such as tobacco.

A baron of beef, a cut made up of a double sirloin.

Any of various nymphalid butterflies of the genus Euthalia.