The Collaborative International Dictionary of English v.0.48:

Pacify \Pac"i*fy\, v. t. [imp. & p. p. Pacified; p. pr. & vb.
   n. Pacifying.] [F. pacifier, L. pacificare; pax, pacis,
   peace + -ficare (in comp.) to make. See Peace, and -fy.]
   To make to be at peace; to appease; to calm; to still; to
   quiet; to allay the agitation, excitement, or resentment of;
   to tranquillize; as, to pacify a man when angry; to pacify
   pride, appetite, or importunity. "Pray ye, pacify yourself."
   --Shak.

   Syn: lenify, assuage, appease, mollify, placate, gentle,
        gruntle.
        [1913 Webster + WordNet 1.5]

              To pacify and settle those countries. --Bacon.
        [1913 Webster]

WordNet (r) 3.0 (2006):

pacify
    v 1: cause to be more favorably inclined; gain the good will of;
         "She managed to mollify the angry customer" [syn: pacify,
         lenify, conciliate, assuage, appease, mollify,
         placate, gentle, gruntle]
    2: fight violence and try to establish peace in (a location);
       "The U.N. troops are working to pacify Bosnia"