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Noun: placidity  plu'si-di-tee
  1. A feeling of calmness; a quiet and undisturbed feeling
    - placidness
  2. A disposition free from stress or emotion
    - repose, quiet, serenity, tranquillity, tranquility [N. Amer]

Derived forms: placidities

Type of: calm, calmness, collectedness, composure, equanimity, unflappability