Webster's Revised Unabridged Dictionary · 1913

Garrison

Garrison , noun

[Old English garnisoun, French garnison garrison, in Old French & Old English also, provision, munitions, from garnir to garnish. See Garnish.]

(a)
(Military) A body of troops stationed in a fort or fortified town.
(b)
(Military) A fortified place, in which troops are quartered for its security.
Collocations (1)
In garrison , in the condition of a garrison; doing duty in a fort or as one of a garrison.

Garrison , transitive verb

(a)
(Military) To place troops in, as a fortification, for its defense; to furnish with soldiers; as, to garrison a fort or town.
(b)
(Military) To secure or defend by fortresses manned with troops; as, to garrison a conquered territory.