Source : Webster's Revised Unabridged Dictionary (1913)

Garrison \Gar"ri*son\, n. [OE. garnisoun, F. garnison garrison,
   in OF. & OE. also, provision, munitions, from garnir to
   garnish. See {Garnish}.] (Mil.)
   (a) A body of troops stationed in a fort or fortified town.
   (b) A fortified place, in which troops are quartered for its
       security.

   {In garrison}, in the condition of a garrison; doing duty in
      a fort or as one of a garrison.

Garrison \Gar"ri*son\, v. t. [imp. & p. p. {Garrisoned}; p. pr.
   & vb. n. {Garrisoning}.] (Mil.)
   (a) To place troops in, as a fortification, for its defense;
       to furnish with soldiers; as, to garrison a fort or town.
   (b) To secure or defend by fortresses manned with troops; as,
       to garrison a conquered territory.

Source : WordNet®

garrison
     n 1: a fortified military post where troops are stationed [syn: {fort}]
     2: United States abolitionist who published an anti-slavery
        journal (1805-1879) [syn: {William Lloyd Garrison}]
     3: the troops who maintain and guard a fortified place
     v : station (troops) in a fort or garrison