deactivation

from WordNet (r) 3.0 (2006)

deactivation
    n 1: breaking up a military unit (by transfers or discharges)
         [syn: {deactivation}, {inactivation}]
    2: the act of deactivating or making ineffective (as a bomb)
       [syn: {deactivation}, {defusing}] [ant: {activation}]

from The Collaborative International Dictionary of English v.0.48

deactivation \de*ac`ti*va"tion\, n.
   The act or process of deactivating.
   [PJC]