baron

noun7

1. •
   a man with the lowest title among British noble families
2. •
   A person of great power in society, especially in business and politics.

   • There were a few exotics among them — some South American boys, sons of Argentine beef barons, one or two Russians, and even a Siamese prince, or someone who was described as a prince. — 1948
3. •
   (UK, slang) A prisoner who gains power and influence by lending or selling goods such as tobacco.

   • The first thing a baron does is to accumulate a supply of tobacco. He spends every penny he can earn on laying it in […] — 1960
4. •
   The male ruler of a barony.
5. •
   A baron of beef, a cut made up of a double sirloin.
6. •
   Any of various nymphalid butterflies of the genus Euthalia.
7. •
   (no longer used) A husband.