The Collaborative International Dictionary of English v.0.48:

Mobilize \Mob"i*lize\, v. t. [imp. & p. p. Mobilized; p. pr. &
   vb. n. Mobilizing.] [F. mobiliser.]
   1. To assemble and organize and make ready for use or action;
      as, to mobilize volunteers for the election campaign.

   Syn: mobilise, marshal.
        [WordNet 1.5]

   2. Specifically: To put in a state of readiness for active
      service in war, as an army corps; as, to mobilize the
      National Guard.

   Syn: mobilise, militarize, militarise.
        [1913 Webster] Moebius strip

WordNet (r) 3.0 (2006):

mobilize
    v 1: make ready for action or use; "marshal resources" [syn:
         mobilize, mobilise, marshal, summon]
    2: call to arms; of military personnel [syn: call up,
       mobilize, mobilise, rally] [ant: demobilise,
       demobilize, inactivate]
    3: get ready for war [syn: mobilize, mobilise] [ant:
       demob, demobilise, demobilize]
    4: cause to move around; "circulate a rumor" [syn: mobilize,
       mobilise, circulate]