The Collaborative International Dictionary of English v.0.48:

Cantonment \Can"ton*ment\, n. [Cf. F. cantonnement.]
   A town or village, or part of a town or village, assigned to
   a body of troops for quarters; temporary shelter or place of
   rest for an army; quarters.
   [1913 Webster]

   Note: When troops are sheltered in huts or quartered in the
         houses of the people during any suspension of
         hostilities, they are said to be in cantonment, or to
         be cantoned. In India, permanent military stations, or
         military towns, are termed cantonments.
         [1913 Webster]

WordNet (r) 3.0 (2006):

cantonment
    n 1: temporary living quarters specially built by the army for
         soldiers; "wherever he went in the camp the men were
         grumbling" [syn: camp, encampment, cantonment,
         bivouac]