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Definition of Robber baron
1. Noun. (historical) In Europe, an aristocrat who charged exorbitant fees or otherwise exacted money from people who journeyed across land or waterways which he controlled. ¹
2. Noun. (chiefly US idiomatic usually derogatory) Especially in the 19th-century and early 20th-century, a business tycoon who had great wealth and influence but whose methods were morally questionable. ¹
¹ Source: wiktionary.com