The Collaborative International Dictionary of English v.0.48:

Commissariat \Com`mis*sa"ri*at\ (?; 277), n. [F. commissariat.]
   (Mil.)
   (a) The organized system by which armies and military posts
       are supplied with food and daily necessaries.
   (b) The body of officers charged with such service.
       [1913 Webster]

WordNet (r) 3.0 (2006):

commissariat
    n 1: a stock or supply of foods [syn: commissariat,
         provisions, provender, viands, victuals]