The Collaborative International Dictionary of English v.0.48:

militarisation \militarisation\ n.
   militarization. [mostly Brit.]

   Syn: mobilization, mobilisation, militarization.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

militarisation
    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]