a military unit consisting of foreign volunteers in the service of a state.
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.
a body of foreign volunteers serving in an army, esp that of France
Collins English Dictionary - Complete & Unabridged 10th Edition
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They have now joined a burgeoning foreign legion in the world's richest, and perhaps best league.