Webster's English Dictionary

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legion

le.gion \'le--j*n\ n [ME, fr. OF, fr. L legion-, legio, fr. legere to 
   gather] 1: the principal unit of the Roman army comprising 3000 to 6000 
   foot soldie rs with cavalry 2: a large military force; esp : ARMY  3: a 
   very large number : MULTITUDE  4: a national association of ex-servicemen