Etymologically
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illustrious

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Pronunciation

  • UK: /ɪˈlʌs.tɹɪ.əs/[1]
  • US: /ɪˈlʌs.tɹi.əs/[1]

Etymology

It is borrowed from Latin illūstris (“lighted, bright; distinguished, famous”) with the English suffix -ous.[2][3][4][5][6] It replaced the earlier English adjective illustre, recorded before 1460, from Middle French illustre.[6][7] The Latin adjective is probably a back-formation from illūstrō (“to light up; to embellish, make famous”),[7][4][8] which is formed from in- (“in”) and lūstrō (“to make bright”), from Proto-Indo-European *leuk- (“light, brightness”).[7]

Earliest recorded meaning

Of things, having the lustre of high rank or noble qualities; distinguished, famous: about 1566, in John Alday's translation of Pierre Boaistuau's Theatrum Mundi.[2][6] Merriam-Webster dates the word to 1588 and Etymonline to the 1560s.[4][7]

Semantic evolution

Used of persons, the word is recorded from 1598, in Shakespeare's Love's Labour's Lost.[2] The literal Latin sense, lighted up or shining, came into English only later, from before 1626 to 1886, and "clearly evident" was used from 1654 to 1792; both are obsolete.[2][9] Johnson (1755) defined it as "conspicuous; noble; eminent for excellence".[10] In Cymbeline the Shakespeare folios print illustrious where the sense seems to be "not lustrous, dull", and editors have replaced it with other forms.[2] Since 1858 Most Illustrious has been the special epithet of the Order of St Patrick.[2]

Timeline

  • c. 1566 – of things, distinguished, famous.[2][6]
  • 1598 – of persons, distinguished, renowned.[2]
  • before 1626 – shining, bright (obsolete by 1886).[2]
  • 1654 – clearly evident (obsolete by 1792).[2]
  • 1858 – Most Illustrious, the epithet of the Order of St Patrick.[2]

Meanings

Adjective

  1. Very distinguished and widely admired for rank, achievements or qualities; renowned, eminent: a scientist with an illustrious career.[4][9][2]
  2. Glorious; splendid: the illustrious victories of the campaign.[9][2]
  3. (obsolete, 1626–1886) Shining, bright.[9][2]

Word family

  • illustriously
  • illustriousness
  • unillustrious

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 n Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  3. ^ Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
  4. ^ a b c d Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  5. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
  6. ^ a b c d Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  7. ^ a b c d Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  8. ^ Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
  9. ^ a b c d Collins English Dictionary (2023), Glasgow: HarperCollins
  10. ^ Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.