Etymologically

Etymology and origin of the Latin word exclusio

Confidence
Established
Formation
Derivation
First attested
190–159 BC Terence More words from the 2nd century BC
Ultimate origin
Latin exclūdō
Etymology tree
inherited borrowed derived
Latin claudō
Latin exclūdō
English exclude
Latin exclūsiō
English exclusion
From the same root
Latin circumclūdō ← claudō
Latin claustrum ← claudō
Latin clausūra ← claudō
Latin clausus ← claudō
Latin clūsa ← claudō
Latin conclūdō ← claudō
Latin disclūdō ← claudō
Latin inclūdō ← claudō
Latin interclūdō ← claudō
Latin occlūdō ← claudō
Latin praeclūdō ← claudō
Latin rēclūdō ← claudō
Latin sēclūdō ← claudō

Forms

exclūsiō f (genitive exclūsiōnis); third declension[1]

Etymology

It is formed from Latin exclūdō + -tiō.[2][3] The verb is formed from ex- and claudō (“to shut”).[3] For that verb de Vaan reconstructs Proto-Italic *klaud-e/o- and Proto-Indo-European *kleh₂u-d- (“to shut”), though he allows that it may instead be derived from the stem of clāvis (“key”).[3]

Earliest recorded meaning

Terence has it in the Eunuch, of a person being shut out: de exclusione verbum nullum, “not a word about the shutting out”.[4][5][3]

Semantic evolution

Lewis & Short call it very rare and note that it is not in Cicero.[4] Vitruvius uses it of keeping out the winds,[4][5] and in law Ulpian describes an exceptio as a kind of exclusion, a debarring.[4][6][2]

Medieval Latin used it widely: for exclusion in general, for an exception, for exclusion from the Church and for banishment.[7] British documents use it for the keeping out of water.[8] Köbler also records a medieval sense “sluice”.[9] English borrowed it about 1400 as exclusion.[10]

Timeline

  • 190–159 BC – Terence uses it of a person shut out.[4][9]
  • c. 84–c. 25 BC – Vitruvius uses it of keeping out the winds.[4][5]
  • before 223 AD – Ulpian uses it in a legal definition.[4][6]
  • 1362 – An English patent roll uses it of keeping out seawater.[8]
  • c. 1400 – English borrows it as exclusion.[10]

Meanings

Noun

  1. The shutting out of a person, exclusion.[2][4][5]
  2. The keeping out of something (such as wind).[4][5]
  3. (law) A Debarring; an exception.[2][6]
  4. (Medieval Latin) Exclusion from the Church; banishment.[7]
  5. (Medieval Latin) A sluice.[9]

References

  1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c d de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  4. ^ a b c d e f g h i Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  5. ^ a b c d e Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  6. ^ a b c Gaffiot, Félix (2016), Dictionnaire latin-français, new ed. by Gérard Gréco et al. (Gaffiot 2016), online ed.
  7. ^ a b Mittellateinisches Wörterbuch bis zum ausgehenden 13. Jahrhundert (1967–), Munich: C. H. Beck; Bayerische Akademie der Wissenschaften
  8. ^ a b Latham, R. E., D. R. Howlett, R. K. Ashdowne, et al. (1975–2013), Dictionary of Medieval Latin from British Sources, London: British Academy / Oxford University Press
  9. ^ a b c Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  10. ^ a b Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
Cite this entry

“Exclusio.” Etymologically, 7 Nov. 2026, etymologically.com/la/exclusio. Accessed 8 Nov. 2026.

Last edited on . ·