serenity
se·re·nity
noun
1.
a disposition free from stress or emotion
2.
Origin
From Middle English serenyte, from Old French serenité, from Latin serēnitās, equivalent to serene + -ity.
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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.