The Collaborative International Dictionary of English v.0.48:

Pacification \Pa*cif`i*ca"tion\, n. [L. pacificatio: cf. F.
   pacification. See Pacify.]
   The act or process of pacifying, or of making peace between
   parties at variance; reconciliation. "An embassy of
   pacification." --Bacon.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pacification
    n 1: the act of appeasing someone or causing someone to be more
         favorably inclined; "a wonderful skill in the pacification
         of crying infants"; "his unsuccessful mollification of the
         mob" [syn: pacification, mollification]
    2: a treaty to cease hostilities; "peace came on November 11th"
       [syn: peace, peace treaty, pacification]
    3: actions taken by a government to defeat insurgency [syn:
       pacification, counterinsurgency]