A battalion is a unit of an army. One battalion usually consists of three or more companies and a headquarters.

The word battalion sounds a lot like battle, and that's a clue to its meaning: battalions are groups engaged in a battle. Specifically, a battalion is a smaller segment of an army. Within a battalion, there will usually be a headquarters, as well as a few smaller units, which are called companies. The members of a battalion will work closely together, whether they are attacking an enemy or defending a base. Veterans always remember the other soldiers in their battalion.

Definitions of battalion
  1. noun
    an army unit usually consisting of a headquarters and three or more companies
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    United States Army Rangers
    a specially trained elite unit of the United States Army
    type of:
    army unit
    a military unit that is part of an army
  2. noun
    a large indefinite number
    “a battalion of ants”
    synonyms: large number, multitude, pack, plurality
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    type of:
    large indefinite amount, large indefinite quantity
    an indefinite quantity that is above the average in size or magnitude
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