tranquillity

or tran·quil·i·ty

[trang-kwil-i-tee]
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Origin of tranquillity

1325–75; Middle English tranquillite < Latin tranquillitās. See tranquil, -ity
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018


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British Dictionary definitions for tranquility

tranquillity

sometimes US tranquility

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

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