Etymologically
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conclusive

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Pronunciation

  • /kənˈkluːsɪv/, /kəŋˈkluːsɪv/[1]

Etymology

It is borrowed from Late Latin conclūsīvus,[2][3][4][5][6][7] from conclūsus, the past participle of conclūdō (“to shut up, enclose”), with the suffix -īvus.[2][7][5][8] The Latin verb is formed from com- (“together”) and claudō (“to shut”).[8] Etymonline takes the English word through French conclusif,[8] which the OED only compares.[2] It is related to conclude, conclusion and close.[8][2]

Earliest recorded meaning

Summing up: 1590, in Robert Greene's Never Too Late, a sense used only in the late 16th century.[2][3][4] Merriam-Webster gives 1536 as the first known use.[5]

Semantic evolution

From 1639 the adjective meant "concluding, occurring at or forming the end", a sense now rare;[2][3] Etymonline dates this sense to the 1610s.[8] The main modern sense, of an argument or statement, "deciding the question, convincing", is recorded from 1649 in the OED, or the 1640s in Etymonline, from the idea of leading to a logical conclusion and so ending the debate.[2][8][3] Johnson (1755) gave "decisive; giving the last determination to the opinion" first.[9] In 17th-century law conclusive could also mean binding, a sense now obsolete,[2] and "final, definitive" is recorded from 1856.[2]

Timeline

  • 1590 – summing up (obsolete).[2][3]
  • 1639 – concluding, forming the end.[2] Etymonline dates this sense to the 1610s.[2][8]
  • 1647 – in law, binding (obsolete).[2]
  • 1649 – decisive, convincing.[2][8]
  • 1856 – final, definitive.[2]

Meanings

Adjective

  1. Putting an end to doubt or debate; decisive or convincing: conclusive evidence.[10][5][2]
  2. Final, definitive.[2][10]
  3. (rare) Forming or coming at the end; concluding.[2][5][3]
  4. (obsolete, 1590) Summing up.[2][3]

Word family

  • conclusively
  • conclusiveness
  • inconclusive
  • nonconclusive

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 Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  3. ^ 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
  4. ^ a b Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
  5. ^ a b c d e Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  6. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
  7. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
  8. ^ a b c d e f g h Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  9. ^ Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
  10. ^ a b Collins English Dictionary (2023), Glasgow: HarperCollins