viability

Etymology

Etymonline, Merriam-Webster and Klein take it as borrowed from French viabilité, from viable (“capable of living”);^[2][3][4] the OED, which revised the entry in 2024, treats it as formed from English viable + -ity after the French word, which is recorded from 1789 in medical use and 1814 in general use.^[5] The French adjective, first said in the 16th century of a fetus able to survive outside the womb, is formed from vie (“life”) and -able;^[5][2] vie comes from Latin vīta (“life”), from Proto-Indo-European *gwei- (“to live”).^[2][6]

Earliest recorded meaning

The capacity of a fetus to survive outside the womb: 1821, in J. G. Smith's Principles of Forensic Medicine.^[5] Etymonline dates the word to 1823, in the same sense, especially of a child just born,^[2] and the OED of 1989 to 1843.^[7]

Semantic evolution

The word followed viable, which was first a term of midwifery (1790) and was then applied to plants and animals able to live in given conditions (1846) and to plans able to be carried out (1879).^[5] Viability was soon used of the ability of any living thing to live, exist or grow;^[5][3] Etymonline dates its use in natural history, for the ability to live in certain conditions, to 1883.^[2] The sense "practicability, feasibility" is recorded from 1860, and it came to be used especially of financial or economic sustainability.^[5] Merriam-Webster's examples range from seeds and fetuses to small new states and economic plans.^[3]

Timeline

• 1821 – the capacity of a fetus to survive outside the womb.^[5]
• 1823 – Etymonline's date for the word.^[2]
• 1837 – a rare homonym, of a road: the state of being passable.^[5]
• 1860 – practicability, feasibility; later especially financial sustainability.^[5]
• 1883 – in natural history, the ability to live in particular conditions.^[2]

Meanings

Noun

1. The ability to live, grow and develop, as of a fetus outside the uterus or of seeds under dry conditions.^[3][5]
2. The quality of being workable or feasible, especially of being financially sustainable: Investors doubted the viability of the new factory.^[5][3]

Related words

• viable
• vital
• vitality

Usage notes

The OED also records a rare viability (1837), the state of a road, route or terrain that allows people or vehicles to pass, from French viabilité (1836), based on Late Latin viabilis, from Latin viō (“to travel”);^[5] the OED of 1989 dated it 1882.^[7]

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
3. ^ a b c d e Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
4. ^ Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
5. ^ a b c d e f g h i j k l Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
6. ^ The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
7. ^ a b Simpson, J. A.; Weiner, E. S. C., eds. (1989), The Oxford English Dictionary, 2nd ed., Oxford: Clarendon Press