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1. Amounting to a large indefinite number
   "Palomar's fans are legion";
   - numerous

1. Association of ex-servicemen
   "the American Legion"
    
2. A large military unit
   "the French Foreign Legion"
    
3. A vast multitude
   - horde, host
    
4. [archaic] Army
   - host [archaic]

Derived forms: legions

See also: beaucoup [US, dialect, informal], many

Type of: army, association, concourse, force, ground forces, military force, military group, military unit, multitude, regular army, throng

Encyclopedia: Legion