Definition of robber baron noun from the Oxford Advanced Learner's Dictionary

 

robber baron

 noun
noun
BrE
 
; NAmE
 
(North American English)
 
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a person in business who becomes very rich, often by illegal means and without caring about other people. The term was applied especially to a number of leading US businessmen in the late 19th century, including John D Rockefeller and Cornelius Vanderbilt.