Noun tranquillity has 3 senses
  1. tranquillity, quiet - an untroubled state; free from disturbances
    --1 is a kind of order
  2. tranquillity, tranquility, quietness, quietude - a state of peace and quiet
    --2 is a kind of calmness
    --2 has particulars:
     peace, peacefulness, peace of mind, repose, serenity, heartsease, ataraxis; easiness, relaxation
  3. repose, quiet, placidity, serenity, tranquillity, tranquility - a disposition free from stress or emotion
    --3 is a kind of composure, calm, calmness, equanimity
    --3 has particulars: ataraxia
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