Noun serenity has 2 senses
  1. repose, quiet, placidity, serenity, tranquillity, tranquility - a disposition free from stress or emotion
    --1 is a kind of composure, calm, calmness, equanimity
    --1 has particulars: ataraxia
  2. peace, peacefulness, peace of mind, repose, serenity, heartsease, ataraxis - the absence of mental stress or anxiety
    --2 is a kind of tranquillity, tranquility, quietness, quietude
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