Noun placidity has 2 senses
  1. placidity, placidness - a feeling of calmness; a quiet and undisturbed feeling
    --1 is a kind of calmness
  2. repose, quiet, placidity, serenity, tranquillity, tranquility - a disposition free from stress or emotion
    --2 is a kind of composure, calm, calmness, equanimity
    --2 has particulars: ataraxia
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