Etymology
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tranquility (n.)

also tranquillity, late 14c., from Old French tranquilite "peace, happiness" (12c.), from Latin tranquillitatem (nominative tranquillitas) "quietness, stillness; serenity," from tranquillus "quiet, calm, still," perhaps from trans- "over" (here perhaps in its intensive sense of "exceedingly") and an adjective from PIE root *kweie- "be quiet," but de Vaan finds this "semantically vague" and phonetically disputable.

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Definitions of tranquility

tranquility (n.)
a disposition free from stress or emotion;
Synonyms: repose / quiet / placidity / serenity / tranquillity
tranquility (n.)
an untroubled state; free from disturbances;
Synonyms: tranquillity / quiet
tranquility (n.)
a state of peace and quiet;
Synonyms: tranquillity / quietness / quietude
From wordnet.princeton.edu