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"

Moby Thesaurus II by Grady Ward, 1.0:

81 Moby Thesaurus words for "pacify":
   allay, alleviate, appease, arrange, array, assuage, calm,
   calm down, cease, compose, conciliate, cool, cool off, cradle,
   defuse, deploy, die down, dispose, dulcify, dwindle, ease, ebb,
   even out, form, gentle, grade, halt, harmonize, hierarchize, hush,
   lay, lay out, lay the dust, line up, lull, marshal, methodize,
   mitigate, moderate, molder, mollify, normalize, order, organize,
   placate, pour balm into, pour balm on, propitiate, qualify, quell,
   quiesce, quiet, quieten, rank, regularize, regulate, relieve, rest,
   rock, rock to sleep, routinize, set up, smooth, smooth down,
   smooth over, smoothen, soften, soothe, stabilize, standardize,
   steady, still, stop, structure, subdue, subside, sweeten,
   systematize, temper, tranquilize, wane