baron

noun

• 1a member of the lowest order of the British nobility. Baron is not used as a form of address, barons usually being referred to as ‘Lord’.
• a member of a foreign nobility having a rank similar to that of a British baron.
• historical a person who held lands or property from the sovereign or a powerful overlord.

• 2 [with modifier] an important or powerful person in a specified business or industry:a press baron