Source : Webster's Revised Unabridged Dictionary (1913)

Appease \Ap*pease"\, v. t. [imp. & p. p. {Appealed}; p. pr. &
   vb. n. {Appeasing}.] [OE. apesen, apaisen, OF. apaisier,
   apaissier, F. apaiser, fr. a (L. ad) + OF. pais peace, F.
   paix, fr. L. pax, pacis. See {Peace}.]
   To make quiet; to calm; to reduce to a state of peace; to
   still; to pacify; to dispel (anger or hatred); as, to appease
   the tumult of the ocean, or of the passions; to appease
   hunger or thirst.

   Syn: To pacify; quiet; conciliate; propitiate; assuage;
        compose; calm; allay; hush; soothe; tranquilize.

Source : WordNet®

appeasing
     adj : tending or intended to pacify by acceding to demands or
           granting concessions; "the appeasing concessions to the
           Nazis at Munich"; "placating (or placative) gestures";
           "an astonishingly placatory speech" [syn: {appeasing(a)},
            {placating}, {placative}, {placatory}]