Etymology
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placidity (n.)

"tranquility, peacefulness, quietness," 1610s, from Latin placiditatem (nominative placiditas), from placidus "peaceful, quiet, gentle, calm" (see placid).

updated on June 30, 2020

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Definitions of placidity from WordNet

placidity (n.)
a feeling of calmness; a quiet and undisturbed feeling;
Synonyms: placidness
placidity (n.)
a disposition free from stress or emotion;
Synonyms: repose / quiet / serenity / tranquillity / tranquility
From wordnet.princeton.edu, not affiliated with etymonline.