noun \ˈlē-jən\

: a large group of soldiers in ancient Rome

: a large group of soldiers

: a national organization for former soldiers

Full Definition of LEGION

:  the principal unit of the Roman army comprising 3000 to 6000 foot soldiers with cavalry
:  a large military force; especially :  army 1a
:  a very large number :  multitude
:  a national association of ex-servicemen

Examples of LEGION

  1. Legions of people came to see him perform.
  2. <joined the French Foreign Legion>

Origin of LEGION

Middle English, from Anglo-French, from Latin legion-, legio, from legere to gather — more at legend
First Known Use: 13th century

Other Military Terms

bivouac, logistics, petard, salient, sally, supernumerary, tactical

Rhymes with LEGION



: very many or numerous

Full Definition of LEGION

:  many, numerous <the problems are legion>

Examples of LEGION

  1. <the obstacles that the programmers had to overcome have been legion>

First Known Use of LEGION



noun    (Concise Encyclopedia)

Military organization, originally the largest permanent unit in the Roman army. It was the basis of the military system by which imperial Rome conquered and ruled its empire. The early Roman Republic found the Greek phalanx too unwieldy for fragmented fighting in the hills and valleys of central Italy. To replace it the Romans evolved a new tactical system based on small and flexible infantry units called maniples. These were grouped in larger units called cohorts, which ranged from 360 to 600 men, depending on the era. Ten cohorts made up a legion, which moved into battle with four cohorts in the first line and three each in the second and third lines. See also Foreign Legion.


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