Etymologically
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decay

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Pronunciation

  • IPA: /diˈkeɪ/; /dɪˈkeɪ/ (UK)[1]

Etymology

It is inherited from Middle English decayen, borrowed from Old Northern French decair (also Anglo-Norman),[2][3][4] a by-form of decheoir (“to fall, decline”) (modern French déchoir),[5][6][7] from Vulgar Latin *dēcadō (“to fall off”),[2][8][9] a refashioning of Latin dēcidō (“to fall off, fall down”),[4][10][11] from dē- (“down, off”) and cadō (“to fall”),[8][7] from Proto-Indo-European *ḱad- (“to fall”).[2][8] It is a doublet of decadence.[12][10]

Earliest recorded meaning

To decrease: 1475, in the Rolls of Parliament.[12][2] The noun, a falling off from a thriving condition, is earlier, from about 1460 in Fortescue in the OED,[7] and 1442 in Barnhart.[12]

Semantic evolution

Ayto sees in both decay and decadence the notion of a falling off from health or perfection.[10] The verb meant to decline or deteriorate before 1500, and to rot or decompose from 1580.[12] The noun followed: wasting away of material things (1523), decline of health (1609, in Shakespeare's Sonnets), and the decomposition of organic tissue (1594).[7][2] In 18th- and 19th-century use a decay could mean consumption,[7] and in Scots it survived for "a decline".[13] Physics adopted it for the decrease of radioactivity in 1897, in Rutherford,[7][2] and later for the decreasing amplitude of a vibration (1906).[7]

Timeline

  • c. 1460 – the noun, decline.[7]
  • 1475 – the verb, to decrease.[12]
  • before 1500 – to deteriorate.[12]
  • 1580 – to rot.[12]
  • 1594 – decomposition of organic tissue.[7]
  • 1897 – radioactive decay.[7][2]

Modern meaning

Verb

  1. To rot or decompose through the action of bacteria or fungi.
  2. To decline gradually in quality, strength or prosperity.
  3. (physics) Of a radioactive nucleus or a particle, to break down into another form.
  4. Of a satellite, to lose height in its orbit.

Noun

  1. The process or state of decaying; rot or decline.

Word family

  • decayer
  • decayable
  • decayless
  • semidecay
  • nondecaying
  • undecaying
  • alpha decay
  • beta decay

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. ^ Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  4. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
  5. ^ Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
  6. ^ Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
  7. ^ a b c d e f g h i j Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  8. ^ a b c The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
  9. ^ Weekley, Ernest (1921), An Etymological Dictionary of Modern English, London: John Murray
  10. ^ a b c Ayto, John (2005), Word Origins: The Secret Histories of English Words from A to Z, 2nd ed., London: A & C Black
  11. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
  12. ^ a b c d e f g Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  13. ^ Wright, Joseph, ed. (1898–1905), The English Dialect Dictionary, 6 vols., Oxford: Henry Frowde; via EDD Online 4.0, University of Innsbruck (CC BY 4.0)