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pontoon

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Etymology and origin of the English word pontoon

Pronunciation

  • /pɒnˈtuːn/[1]

pontoon1 float, floating bridge

Confidence
Established
Formation
Borrowing
First attested
1590 R. Williams, Briefe Discourse of Warre
Borrowed from
Middle French ponton
Ultimate origin
Latin pōns

Etymology

The word for the float is borrowed from Middle French ponton,[2][3][4] recorded in Old French as a bridge about 1245 or earlier, as a drawbridge before 1370, as a flat-bottomed boat in the late 14th century and as a floating bridge of boats in 1532.[2][5] It is from Latin pontō (“flat-bottomed boat, ferry, punt”), stem pontōn-,[2][5][6] from pōns (“bridge”),[2][5][4][7] which the American Heritage Dictionary refers to Proto-Indo-European *pent-.[4] The OED notes that the exact meaning of the Latin word is uncertain, and so also its relation to the word for bridge.[2] Skeat took it as Celtic,[8] and Weekley as probably Celtic but associated with the word for bridge.[9] According to Ayto the Latin word also named a kind of boat of the Gauls, and in that sense is the source of punt.[10][2]

Earliest recorded meaning

A bridge: 1590, in R. Williams's Briefe Discourse of Warre, chiefly a military word, whose general sense is now obsolete and which was later narrowed to a temporary floating bridge.[2] The revised OED thus antedates the 1676 of Barnhart, Merriam-Webster Unabridged and, as the 1670s, Etymonline, whose first sense is the flat-bottomed boat or float;[2][6][11][5] Merriam-Webster's Collegiate gives 1690.[12] Hoad records the early spelling ponton.[3]

Semantic evolution

The word moved from the bridge to what held it up: from 1676 a pontoon was also the boat or float that carried a temporary bridge, with pontoon bridge recorded from 1778 in Etymonline and 1779 in Barnhart.[2][5][6] A pontoon was also a flat-bottomed ferry until 1769,[2] the year in which Falconer's dictionary of the marine first records the barge with cranes and capstans for careening ships;[2] Smyth (1867) notes that these were used mainly in the Mediterranean.[13] In the 19th century the word spread to salvage floats and to floating landing stages (both 1859),[2] and Barnhart dates the general sense of any buoyant structure only to 1941.[6] The seaplane's float took the name too,[12][14] and a pontoon boat is originally an American term, from 1962.[2] The verb, partly after French pontonner, is recorded from 1761 for fitting with pontoons, and for crossing a river by them from 1834.[2]

Timeline

  • 1590 – a bridge, later specifically a temporary floating bridge.[2]
  • 1676 – a flat-bottomed boat or other float supporting a temporary bridge.[2][6][11]
  • 1681 – a flat-bottomed boat used as a ferry (obsolete after 1769).[2]
  • 1761 – verb, to provide with pontoons or transport by them.[2]
  • 1769 – a barge with cranes and capstans for careening ships.[2]
  • 1778 – pontoon bridge.[5] Barnhart dates it to 1779.[6]
  • 1834 – verb, to bridge or cross a river by pontoons.[2]
  • 1859 – a floating platform used as a landing stage or dock; a salvage float.[2]
  • 1962 – a pontoon boat.[2]

Meanings

Noun

  1. A flat-bottomed boat, hollow metal cylinder or other float used to support a temporary bridge, a raft or the like.[2][15][14]
  2. A temporary floating bridge resting on such floats, chiefly in military use.[2]
  3. A floating platform used as a dock or landing stage.[2][14]
  4. A float fitted to a seaplane.[12][14]
  5. A float that can be sunk or raised by taking in or expelling water, used in salvage and for raising vessels; a caisson.[2][15]
  6. A low, flat barge carrying cranes, capstans and other machinery for careening ships, raising weights and similar work.[11][2][13]
  7. A flat-bottomed boat such as a lighter or ferry.[12][16][2]
  8. A pontoon boat.[2]

Verb

  1. To bridge or cross by pontoons: The engineers pontooned the river before dawn.[11][2]
  2. To fit with pontoons, or to float or carry by means of them.[2]

Word family

  • pontooner
  • pontoon bridge
  • pontoon boat
  • pontonier

pontoon2 card game

Confidence
Probable
Formation
Derivation
First attested
1917 A. G. Empey
Ultimate origin
French vingt-et-un

Etymology

The word for the card game is apparently an alteration from English of vingt-et-un,[2][11][17][10][7] in the obsolete form vingt-un according to the Shorter Oxford,[16] reshaped after pontoon1.[2][10] Merriam-Webster's Collegiate says only "perhaps".[12] The name goes back to French vingt-et-un (“twenty-one”), the perfect score in the game.[10][15]

Earliest recorded meaning

The card game: 1917, in A. G. Empey.[2] Merriam-Webster Unabridged has about 1917,[11] and Dictionary.com gives 1915–20.[18]

Semantic evolution

The word stayed mainly British.[11] The number behind the name carried over into slang: from 1948 a pontoon was a term of twenty-one months, especially in prison, occasionally twenty-one years, or twenty-one years of service in the forces,[2][16] and Green's records the prison sense from 1958 to 1989.[19] From 1972 the OED also records the word for a hand that totals twenty-one after the first deal, a natural.[2][16]

Timeline

  • 1917 – a card game with a target of twenty-one.[2][11]
  • 1948 – (slang) a term of twenty-one months.[2]
  • 1972 – a hand totalling twenty-one after the first deal.[2]

Meanings

Noun

  1. (British) A card game in which players try to collect cards totalling twenty-one without going over; blackjack, vingt-et-un.[11][2][16]
  2. A hand totalling twenty-one after the first deal in this game.[2][16]
  3. (slang) A term of twenty-one months, especially in prison.[2][19][16]

References

  1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  3. ^ a b Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
  4. ^ a b c The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
  5. ^ a b c d e f Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  6. ^ a b c d e f Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  7. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
  8. ^ Skeat, Walter W. (1911), A Concise Etymological Dictionary of the English Language, new ed., Oxford: Clarendon Press
  9. ^ Weekley, Ernest (1921), An Etymological Dictionary of Modern English, London: John Murray
  10. ^ a b c d Ayto, John (2005), Word Origins: The Secret Histories of English Words from A to Z, 2nd ed., London: A & C Black
  11. ^ a b c d e f g h i Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  12. ^ a b c d e Merriam-Webster's Collegiate Dictionary (2003), 11th ed., Springfield, Mass.: Merriam-Webster
  13. ^ a b Smyth, W. H. (1867), The Sailor's Word-Book: An Alphabetical Digest of Nautical Terms, London: Blackie and Son
  14. ^ a b c d The American Heritage Dictionary of the English Language (1992), 3rd ed., Boston: Houghton Mifflin
  15. ^ a b c Collins English Dictionary (2023), Glasgow: HarperCollins
  16. ^ a b c d e f g Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
  17. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
  18. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
  19. ^ a b Green, Jonathon (2010), Green's Dictionary of Slang, London: Chambers; digital ed. 2016–, https://greensdictofslang.com

Related etymologies

Cite this entry

“Pontoon.” Etymologically, 6 Nov. 2026, etymologically.com/en/pontoon. Accessed 7 Nov. 2026.

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