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1. The act of appeasing (as by acceding to the demands of)
   - appeasement

1. Make calm or still
   "calm the dragons of worry and fear";
   - calm down, quiet, tranquilize [N. Amer], tranquillize, tranquillise [Brit], quieten [Brit], lull, still
    
2. Stop being excited, agitated or moving
   "calm yourself";
   - steady, becalm
    
3. Become quiet or calm, especially after a state of agitation
   "After the fight both men need to calm down.";
   - calm down, cool off, chill out [informal], simmer down, settle down, cool it [informal], wind down, take a chill pill [informal]
    
4. Cause to be calm or quiet as by administering a sedative to
   "The patient must be calmed before the operation";
   - sedate, tranquilize [N. Amer], tranquillize, tranquillise [Brit]

Type of: affect, change state, comfort, console, social control, solace, soothe, stabilise [Brit], stabilize, turn

Encyclopedia: Calm, Missouri