The Collaborative International Dictionary of English v.0.48:

Mobilization \Mob`i*li*za"tion\, n. [F. mobilization.]
   The act of mobilizing.
   [1913 Webster]

WordNet (r) 3.0 (2006):

mobilization
    n 1: act of assembling and putting into readiness for war or
         other emergency: "mobilization of the troops" [syn:
         mobilization, mobilisation, militarization,
         militarisation] [ant: demobilisation, demobilization]
    2: act of marshaling and organizing and making ready for use or
       action; "mobilization of the country's economic resources"
       [syn: mobilization, mobilisation]