Etymologically
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impetus

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Pronunciation

  • /ˈɪm.pə.təs/[1]

Etymology

It is borrowed from Latin impetus (“attack, assault; rapid motion; impulse; violence, force”),[2][3][4][5] from impetō (“to rush upon, attack, assail”),[2][3][6] formed from in- (“into, upon”) and petō (“to aim for, rush at, seek”),[3][6][7][8] from Proto-Indo-European *pet- (“to rush, to fly”).[3][6] Dictionary.com suggests that the Latin noun was shortened by haplology from an unrecorded form *impetitus.[9] The Latin noun had been borrowed once before, as impetous (“rapid movement, rush”), probably before 1425 in a translation of Guy de Chauliac's surgery.[10][7] The adjective impetuous is impetuōsus, from the same Latin noun.[7] Skeat and Barnhart relate it to petition, and Merriam-Webster to feather.[11][7][4]

Earliest recorded meaning

Moving force, impulse or stimulus, of feelings and actions: 1641.[2][4][7] Etymonline dates the modern spelling to the 1640s, in the sense "force with which a body moves, driving force".[3]

Semantic evolution

In Latin the noun meant an attack or assault, and also rapid motion, an impulse and violence; figuratively it meant ardour or passion.[3] The Middle English impetous meant a rapid movement or rush.[10][3] The figurative sense came first in the modern borrowing (1641), and the physical one, the force with which a moving body keeps its speed and overcomes resistance, in 1656, in Hobbes.[2] Johnson (1755) defined it as "violent tendency to any point; violent effort".[12] In gunnery, from 1807, impetus was the height from which a projectile would have to fall to reach its initial velocity.[2] Today it most often means an incentive or stimulus that makes an activity happen or grow faster.[4][13]

Timeline

  • probably before 1425 – impetous, a rapid movement, rush.[10][7]
  • 1641 – moving force, impulse, stimulus.[2][4]
  • 1656 – the force with which a moving body maintains its velocity.[2]
  • 1807 – in gunnery, the height due to a projectile's initial velocity.[2]

Meanings

Noun

  1. A driving force; an incentive or stimulus that makes something happen: The grant gave fresh impetus to the research.[4][13][2]
  2. (physics) The force or energy with which a body moves; momentum.[13][4][2]

References

  1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  3. ^ a b c d e f g Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  4. ^ a b c d e f g Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  5. ^ Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
  6. ^ a b c The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
  7. ^ a b c d e f Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  8. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
  9. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
  10. ^ a b c Kurath, Hans; Kuhn, Sherman M.; Lewis, Robert E., eds. (1952–2001), Middle English Dictionary, Ann Arbor: University of Michigan Press; online edition ed. Frances McSparran et al. (2000–2018)
  11. ^ Skeat, Walter W. (1911), A Concise Etymological Dictionary of the English Language, new ed., Oxford: Clarendon Press
  12. ^ Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
  13. ^ a b c Collins English Dictionary (2023), Glasgow: HarperCollins