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