Source : Webster's Revised Unabridged Dictionary (1913)

Brigade \Bri*gade"\, n. [F. brigade, fr. It. brigata troop,
   crew, brigade, originally, a contending troop, fr. briga
   trouble, quarrel. See {Brigand}.]
   1. (Mil.) A body of troops, whether cavalry, artillery,
      infantry, or mixed, consisting of two or more regiments,
      under the command of a brigadier general.

   Note: Two or more brigades constitute a division, commanded
         by a major general; two or more divisions constitute an
         army corps, or corps d'arm['e]e. [U.S.]

   2. Any body of persons organized for acting or marching
      together under authority; as, a fire brigade.

   {Brigade inspector}, an officer whose duty is to inspect
      troops in companies before they are mustered into service.
      

   {Brigade major}, an officer who may be attached to a brigade
      to assist the brigadier in his duties.

Brigade \Bri*gade"\, v. t. [imp. & p. p. {Brigaded}; p. pr. &
   vb. n. {Brigading}.] (Mil.)
   To form into a brigade, or into brigades.

Source : WordNet®

brigade
     n : army unit smaller than a division
     v : form or unite into a brigade