sanity

Etymology

It is inherited from Middle English sanite (“health”),^[2][3][4] borrowed from Middle French sanité (“health”),^[5][2][4] and directly borrowed from Latin sānitās (“health, soundness of body; soundness of mind, reason”).^[3][6][7][8] Etymonline gives the French word as Old French, and the OED as French.^[8][9] The Latin noun is formed from sānus (“healthy, sane”), the source of sane, with the suffix that became English -ity.^[3][10][4] By regular development the Latin noun also gave French santé (“health”),^[11] recorded in Anglo-Norman from the early 12th century.^[12] sanitary, sanitation and sanatorium, all of the 19th century, come from the same root.^[13]

Earliest recorded meaning

Healthy condition, good health: probably before 1425, in a translation of Higden's Polychronicon,^[2][9] a sense now archaic.^[9][10]

Semantic evolution

The first sense of the word was bodily health, as in Latin.^[13][8] The sense "soundness of mind" appeared around 1600,^[8] first in Shakespeare's Hamlet (1602 in Barnhart; the OED quotes the 1623 text).^[2][9] Cresswell notes that the current meanings date from the early 17th century, when sane itself is first recorded, although insane goes back to the mid-16th century.^[13] Johnson (1755) defined it only as "soundness of mind", quoting the same passage of Hamlet.^[14] Short-lived senses were "wholesomeness" (1613–1731) and, once in 1769, "soundness" of a material.^[9][10] The sense "good sense, soundness of judgement" is now usual beside mental health.^[15][10]

Timeline

• c. 1425 – health, healthy condition.^[2][9]
• 1602 – soundness of mind, in Shakespeare's Hamlet.^[2][9]
• 1613 – wholesomeness (obsolete by 1731).^[9]
• 1755 – Johnson defines it as soundness of mind.^[14]
• 1769 – soundness of a material (rare, obsolete).^[9]

Meanings

Noun

1. The state of being sane; soundness of mind, mental health: After a month alone at the lighthouse he began to doubt his own sanity.^[15][3][9]
2. Good sense; soundness of judgement: She was the one voice of sanity at the meeting.^[15][10]
3. (archaic) Bodily health.^[9][10][3]

Word family

• insanity
• nonsanity

Related words

• sane
• insane
• sanitary
• sanitation
• sanatorium

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
3. ^ a b c d e Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
4. ^ a b c Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
5. ^ Barnhart, Robert K., ed. (1995), The Barnhart Concise Dictionary of Etymology, New York: HarperCollins
6. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
7. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
8. ^ a b c d Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
9. ^ a b c d e f g h i j k Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
10. ^ a b c d e f Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
11. ^ Weekley, Ernest (1921), An Etymological Dictionary of Modern English, London: John Murray
12. ^ Anglo-Norman Dictionary (AND2), Aberystwyth University, anglo-norman.net (2nd ed., 2005–)
13. ^ a b c Cresswell, Julia (2021), Oxford Dictionary of Word Origins, 3rd ed., Oxford: Oxford University Press
14. ^ a b Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
15. ^ a b c Collins English Dictionary (2023), Glasgow: HarperCollins