the state of being sane; soundness of mind.
soundness of judgment.

1400–50; late Middle English sanite < Latin sānitās. See sane, -ity

nonsanity, noun
supersanity, noun
unsanity, noun

2. reason, rationality, sensibleness, reasonableness. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sanity (ˈsænɪtɪ)
1.  the state of being sane
2.  good sense or soundness of judgment
[C15: from Latin sānitās health, from sānus healthy]

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

early 15c., "healthy condition," from M.Fr. sanité "health," from L. sanitas "health, sanity," from sanus "healthy, sane." Meaning "soundness of mind" first attested c.1600.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

sanity san·i·ty (sān'ĭ-tē)

  1. The quality or condition of being sane; soundness of mind.

  2. Soundness of judgment or reason.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
No question would seem harder to settle than the sanity or insanity of our
Maybe your workout routine continued to preserve your sanity through the
  calendar's ups and downs.
Both sides need an energetic push from outside to make the leap to sanity.
Concentrating on the pictures instead of the equipment is the path to sanity
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