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tranquillity

or tranquility

[trang-kwil-i-tee] /træŋˈkwɪl ɪ ti/
noun
1.
quality or state of being tranquil; calmness; peacefulness; quiet; serenity.
Origin of tranquillity
1325-1375
1325-75; Middle English tranquillite < Latin tranquillitās. See tranquil, -ity
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for tranquility

tranquillity

/træŋˈkwɪlɪtɪ/
noun
1.
a state of calm or quietude
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for tranquility
n.

also tranquillity, late 14c., from Old French tranquilite (12c.), from Latin tranquillitatem (nominative tranquillitas) "tranquilness," from tranquillus "tranquil," perhaps from trans- "over" (here in its intensive sense of "exceedingly") + a root related to quies "rest" (see quiet (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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