free from commotion or tumult; peaceful; quiet; calm: a tranquil country place.
free from or unaffected by disturbing emotions; unagitated; serene; placid: a tranquil life.

1595–1605; earlier tranquill < Latin tranquillus quiet, calm, still

tranquilly, adverb
tranquilness, noun
untranquil, adjective
untranquilly, adverb
untranquilness, noun

1. See peaceful.

1. agitated. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tranquil (ˈtræŋkwɪl)
calm, peaceful or quiet
[C17: from Latin tranquillus]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1600, from Fr. tranquille (late 15c.), from L. tranquillus "quiet" (see tranquility).
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

TRANQUIL definition

1966. ALGOL-like language with sets and other extensions, for the Illiac IV. "TRANQUIL: A Language for an Array Processing Computer", N.E. Abel et al, Proc SJCC 34 (1969).

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Situated under a canopy of pine trees, it provides a peaceful and tranquil
  location for the treatment of addictive disorders.
The lake is small, roughly half a square mile in area, now once again blue and
But instead the spacecraft now finds itself in an unexpectedly tranquil zone.
Zen archery is good because you can learn to be tranquil while you're actually
  shooting at something.
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