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foreign legion

noun
  1. a military unit consisting of foreign volunteers in the service of a state.
  2. (initial capital letters) a specialized military unit of the French army, consisting of volunteers of all nationalities assigned to military operations and duties outside France.
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Origin of foreign legion

An Americanism dating back to 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for foreign legion

foreign legion

noun
  1. a body of foreign volunteers serving in an army, esp that of France
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012