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]

Moby Thesaurus II by Grady Ward, 1.0:

124 Moby Thesaurus words for "mobilization":
   activation, activity, actuation, arms race, arrangement,
   assemblage, assembly, basic training, briefing, bugle call, call,
   call to arms, call-up, canvass, catchword, census, clarion,
   clarion call, clearing the decks, collection, colligation,
   collocation, combination, comparison, compulsory military service,
   concourse, concurrence, confluence, conflux, congregation,
   conscription, convergence, corralling, data-gathering, draft,
   draft call, drafting, dynamics, enlistment, enrollment, equipment,
   exhortation, familiarization, fixing, foundation, garrison state,
   gathering, go for broke, going, groundwork, gung ho, impressment,
   induction, ingathering, inventory, junction, juxtaposition,
   kinematics, kinesipathy, kinesis, kinesitherapy, kinetics, levy,
   makeready, making ready, manufacture, martial law, militarization,
   motion, motivation, move, movement, moving, muster, planning,
   prearrangement, preliminaries, preliminary, preliminary act,
   preliminary step, prep, preparation, preparatory study, preparing,
   prepping, prerequisite, press, pretreatment, processing,
   propaedeutic, provision, rally, rallying cry, reactivation,
   readying, rebel yell, recruiting, recruitment, remilitarization,
   restlessness, rodeo, roundup, running, selective service, slogan,
   spadework, stir, stirring, summons, survey, training, treatment,
   trial, trumpet call, tryout, unrest, velocity, war clouds, war cry,
   war footing, war whoop, warm-up, wartime footing, watchword