Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. The quality or condition of being sane; soundness of mind.
- n. Soundness of judgment or reason.
Century Dictionary and Cyclopedia
- n. The state or character of being sane; soundness of mind; saneness. See insanity.
Wiktionary
- n. The condition of being sane.
- n. Reasonable and rational behaviour.
GNU Webster's 1913
- n. The condition or quality of being sane; soundness of health of body or mind, especially of the mind; saneness.
WordNet 3.0
- n. normal or sound powers of mind
Etymologies
- Latin sānitas, from sānus ("healthy") + -itās ("-ity"). See sane, -ity (Wiktionary)
- Middle English sanite, health, from Old French, from Latin sānitās, from sānus, healthy. (American Heritage® Dictionary of the English Language, Fourth Edition)
Examples
“Maybe it seems silly, but if your life or your sanity is at risk, it's not a bad idea.”
“Now when he was misusing his authority to browbeat me into what he termed sanity, I found comfort in recalling that after all he had once in a moment of forgetfulness confessed to having a home at Mentone Park, with a wife and four daughters of whose accomplishments he spoke almost with boasting.”
“And that unknown means Owen is facing her new pregnancy with as much fear as joy, repeating what she calls sanity sonograms for reassurance that this baby's still fine.”
“It may be rude, but fuck it, my sanity is at stake.”
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“It looked like the builders had struggled to maintain sanity, or that the backlash had pushed at them harder in some spots than in others.”
“Maybe focusing on long term fiscal sanity is a better idea than going bonkers with debt financed Keynesian “stimulus” that is nothing but relabeled Reagan supply side bullshit.”
“And then little Howard enters the hideous cave and encounters the blasphemous monstrosity of unspeakable horror where his sanity is destroyed and his insignificant place among the cosmos is finally revealed -- but you don't have to take my word for it!”
“Nothing less than survival, or sanity, is usually at stake.”
“Are partisan pundits, tea partiers, leftist activists, members of the House, and architects of GOP politics all equally lacking in sanity?”
Lists
These user-created lists contain the word ‘sanity’.
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Words related to knowledge
Words that relate to learning, knowing, being enlightened...
revelation, eureka, awakening, idea, sapient, astute, canny, intelligent, wise, sharp, shrewd, informed and 467 more...
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2nd part
prelude, ample, escalate, prototype, accession, acquisition, archives, zealot, indict, verdict, intimidating, timid and 454 more...
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Big Meaningful Words
Words that emcompass large concepts
idea, love, history, thought, life, sanity, earth, trinity, god, honesty, truth
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The condom-free preserve
Italian-English false friends.
One a day, maybe even less.
Contributors: Prolagus, bilbypreservative, engross, camera, janitor, dent, fastidious, morbid, crude, juvenile, bald, confetti, pollution and 29 more...
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Theme Prompts
There's a fiction meme (mostly on Livejournal) where writers use words as a prompt for a short story snippet. I've been collecting the words that show up on these lists as prompts for creative writ...
white, black, gray, red, orange, yellow, green, indigo, violet, queen, king, prince and 407 more...
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Tunie: Vincent
By Don McLean
Starry, starry night
Paint your palette blue and gray
Look out on a summer's day
With eyes that know the darkness in my soul
Shadows on the hills<...free, virgin, beautiful, starry, suffer, amber, violet, listen, sanity, breeze, shadow, palette
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Quotables
Wonderful words featured in some of my favourite quotable quotes.
shirty, coffee spoons, vociferate, lies, happiness, insanity, writing, despair, commandeer, heaven, doubt, abstract and 48 more...
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Health
Words meaning health or good health
valetude, salubrity, salutariness, sanity, mens sana in corp..., salubriousness
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Word that have no equivalent in German
Tweets
Looking for tweets for sanity.

Prolagus Sanità, in Italian, is the health board.
A few years ago, the Italian Health Board launched a new product, a card with a microchip containing the user's data about immunization status, allergies, blood type, etc. In an attempt to sound more international, this card was named Sanity Card.
(In case you don't believe me) Apr 15, 2009
anydelirium 'Sanity is madness put to good use.' -attributed to George Santayana Feb 19, 2008