tranquility

from WordNet (r) 3.0 (2006)
tranquility
    n 1: a disposition free from stress or emotion [syn: {repose},
         {quiet}, {placidity}, {serenity}, {tranquillity},
         {tranquility}]
    2: an untroubled state; free from disturbances [syn:
       {tranquillity}, {tranquility}, {quiet}]
    3: a state of peace and quiet [syn: {tranquillity},
       {tranquility}, {quietness}, {quietude}]
    

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