Etymologically
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deploy

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Pronunciation

  • /dɪˈplɔɪ/[1]

Etymology

It is borrowed from French déployer (“to unroll, unfold”),[2][3][4][5] in Old French desployer, earlier despleier,[2][4][5] inherited from Latin displicō (“to unfold, scatter”),[2][3][5] formed from dis- (“apart”) and plicō (“to fold”),[5][3] from Proto-Indo-European *plek- (“to plait”).[3][5] The Oxford Dictionary of English and the Shorter Oxford also name Late Latin deplicō (“to unfold, explain”).[6][7] The OED notes that the Anglo-Norman form of the French verb had already given Middle English display, so the two are doublets;[2][4][8][9] Caxton used the forms deploye and dysploye after Parisian French, but the word was only really adopted, in a military sense, at the end of the 18th century.[2][4][10]

Earliest recorded meaning

To unfold or display: in Caxton's translation of Le Fèvre's History of Jason (1477), a use that did not survive the late 15th century.[2][7][4] Dictionary.com dates the word to 1470–80.[11]

Semantic evolution

The word came back from French in the late 18th century as a military term.[2][10][3] From 1786 it meant to spread out troops so that they formed a longer line of less depth, as when a unit that had been in columns was opened out,[2][3][4] and a body of troops itself was said to deploy from 1796;[2][3] the noun deploy, the act of deploying, and deployment are recorded from the same year.[2][4] Merriam-Webster, however, gives 1616 as the first known use of the military sense.[12] Figurative use is found by 1829.[3] Modern dictionaries have widened it to placing forces in battle formation or in positions for later use, to placing people or equipment as if they were troops,[12] and to bringing forces or material into action or putting anything into use;[13] in computing it also means to install and put a system or program into operation.[1]

Timeline

  • 1477 – to unfold, display, in Caxton (obsolete by 1490).[2]
  • 1616 – the military sense, as Merriam-Webster dates it.[12]
  • 1786 – to spread out troops into a longer, shallower line.[2][3][4]
  • 1796 – intransitive, of troops; also the noun deploy and deployment.[2][3][4]
  • 1829 – figurative use.[3]

Modern meaning

Verb

  1. To spread out or position troops or other forces in readiness for combat or other action: The general deployed two battalions along the river.
  2. To move or send forces to a given area, or to redistribute them within it.
  3. Of troops: to spread out into a wider formation.
  4. To bring into use or put to work, as people, equipment or resources: The firm deployed its best engineers on the new bridge.
  5. To unfold or open so as to be ready for use.
  6. To install, test and put into operation a computer system or application.

Noun

  1. (rare) Deployment.

Word family

References

  1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  3. ^ a b c d e f g h i j k Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  4. ^ a b c d e f g h i Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  5. ^ a b c d e The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
  6. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
  7. ^ a b Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
  8. ^ Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
  9. ^ Skeat, Walter W. (1911), A Concise Etymological Dictionary of the English Language, new ed., Oxford: Clarendon Press
  10. ^ a b Weekley, Ernest (1921), An Etymological Dictionary of Modern English, London: John Murray
  11. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
  12. ^ a b c Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  13. ^ The American Heritage Dictionary of the English Language (1992), 3rd ed., Boston: Houghton Mifflin