battalion

Short definition from Wiktionary

Noun

1. 1
   An army unit having two or more companies, etc. and a headquarters. Traditionally forming part of a regiment.
2. 2
   an army unit having two or more companies, etc. and a headquarters; forming part of a brigade.
3. 3
   Any large body of troops.
4. 4
   A great number of things.

Verb

1. 1
   To form into battalions.