placidity
pla·ci·dity
noun
1.
a feeling of calmness; a quiet and undisturbed feeling
2.
a disposition free from stress or emotion
Origin
From placid + -ity, from Latin placiditās (“mildness, placidity”).
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.