Etymologically

illegalis

Etymology and origin of the Latin word illegalis

Confidence
Established
Formation
Derivation
First attested
Late Latin glossaries
Ultimate origin
Latin lēgālis
Etymology tree
inherited borrowed derived
Latin lex
French loi
Italian legge
Latin legalis
English legal
Italian legale
Latin illegalis
French illégal
English illegal
From the same root
Latin legifer ← lex
Italian illegale ← legale

Pronunciation

  • Classical: [ɪl.leːˈɡaː.lɪs][1]
  • Ecclesiastical: [il.leˈɡaː.lis][1]

Forms

illēgālis (neuter illēgāle); third-declension two-termination adjective[1]

Etymology

It is from Latin in-2 (“not”) + lēgālis (“legal”).[2][3][4] The DMLBS labels it a Late Latin gloss word.[5]

Earliest recorded meaning

It first appears in Late Latin glossaries:[2][5] the Corpus Glossary explains anomalum by inlegale,[5] and the adverb illēgāliter occurs in a Latin version of the acts of a church council.[2]

Semantic evolution

In the Middle Ages it means both “unlawful, against the law” and “outside the law”: the MLW quotes it of unlawful exchanges of church property in the Freising charters (after 938) and of men declared disinherited and lawless in a diploma of Otto I,[6] and Niermeyer and Du Cange give “outlawed”, as in the Sachsenspiegel.[7][8] Albert the Great uses it in ethics of the unjust man, at odds with the law, and music theory for what is irregular or anomalous.[6] English illegal (1630s) is from French illégal or directly from Medieval Latin.[4]

Timeline

  • after 938 – The Freising traditions speak of unlawful exchanges of church property.[6]
  • 966 – A diploma of Otto I uses it of outlaws.[8][6]
  • 13th century – Albert the Great uses it in his commentary on the Ethics.[6][3]
  • 1630s – English illegal is first recorded.[4]

Meanings

Adjective

  1. (Medieval Latin) unlawful, illegal.[6][1]
  2. (Medieval Latin) Outlawed; obeying no law, lawless.[7][8][5][6]
  3. (Medieval Latin, music) Irregular, anomalous.[6]

References

  1. ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  3. ^ a b Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  4. ^ a b c Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  5. ^ a b c d 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
  6. ^ a b c d e f g h Mittellateinisches Wörterbuch bis zum ausgehenden 13. Jahrhundert (1967–), Munich: C. H. Beck; Bayerische Akademie der Wissenschaften
  7. ^ a b Niermeyer, J. F. (1976), Mediae Latinitatis Lexicon Minus, Leiden: Brill
  8. ^ a b c du Cange, Charles du Fresne, et al. (1883–1887), Glossarium mediae et infimae latinitatis, augmented ed. by Léopold Favre, Niort: L. Favre

Borrowed into

Descendants

Cite this entry

“Illegalis.” Etymologically, 23 Oct. 2026, etymologically.com/la/illegalis. Accessed 23 Oct. 2026.

Last edited on . ·