placidity

from WordNet (r) 3.0 (2006)

placidity
    n 1: a feeling of calmness; a quiet and undisturbed feeling
         [syn: {placidity}, {placidness}]
    2: a disposition free from stress or emotion [syn: {repose},
       {quiet}, {placidity}, {serenity}, {tranquillity},
       {tranquility}]

from The Collaborative International Dictionary of English v.0.48

Placidity \Pla*cid"i*ty\, n. [L. placiditas: cf. F.
   placidit['e].]
   The quality or state of being placid; calmness; serenity.
   --Hawthorne.
   [1913 Webster]

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