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sanity (n.)

early 15c., "healthy condition," from Old French sanité "health," from Latin sanitatem (nominative sanitas) "health, sanity," from sanus "healthy; sane" (see sane). Meaning "soundness of mind" is attested from c. 1600.

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Definitions of sanity from WordNet

sanity (n.)
normal or sound powers of mind;
Synonyms: saneness
From wordnet.princeton.edu