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Definition of Pinkerton
1. Proper noun. (surname Scottish and Northern Irish habitational from=Old English dot=) for someone from a place of that name near Dunbar. ¹
2. Proper noun. (context: dated countable) An operative employed by the Pinkerton National Detective Agency founded by Allan Pinkerton (1819-1884). ¹
¹ Source: wiktionary.com