Etymologically

illegal

Etymology and origin of the English word illegal

Confidence
Established
Formation
Borrowing
First attested
1538
Borrowed from
French illégal
Ultimate origin
Medieval Latin (illegālis)

Pronunciation

  • IPA: /ɪˈliː.ɡəl/[1]

Etymology

It is borrowed from French illégal or directly from Medieval Latin illegālis,[2][3][4] from Latin il-, the assimilated form of in- (“not”), and lēgālis (“legal”).[2][3] It is related to legal and illegality.[2][3]

Earliest recorded meaning

Contrary to law: 1626 in the OED and Barnhart,[5][3] the 1630s in Etymonline;[2] Merriam-Webster dates it to 1538.[6]

Semantic evolution

Illegally is from the 1620s[2] and illegality from 1639.[3] Illegal immigrant is recorded by 1892 in American English, and illegal immigration from 1887;[2] in British use from the late 1930s it was applied to Jews entering Palestine.[2][5] The noun, an illegal immigrant, is from 1939,[5][6] and a Soviet secret agent working abroad without diplomatic cover from 1968.[5] In computing it means unacceptable to a program.[7] The Century Dictionary held that it implies a real breach of law, not a mere irregularity of procedure.[2]

Timeline

  • 1538 – first known use.[6]
  • 1626 – contrary to law.[5][3]
  • 1639 – illegality.[3]
  • 1892 – illegal immigrant.[2]
  • 1939 – noun, an illegal immigrant.[5]
  • 1968 – a Soviet agent.[5]

Modern meaning

Adjective

  1. Forbidden by law; unlawful.
  2. Against the official rules, as of a game.
  3. In computing, not acceptable to or performable by a program.

Noun

  1. (informal) An illegal immigrant.

Word family

  • illegally
  • illegality
  • illegalize
  • illegal alien
  • legal
  • illicit
  • legitimate
  • loyal

References

  1. ^ Jones, Daniel (2011), Cambridge English Pronouncing Dictionary, 18th ed., ed. Peter Roach, Jane Setter and John Esling, Cambridge: Cambridge University Press
  2. ^ a b c d e f g h i Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  3. ^ a b c d e f g Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  4. ^ Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
  5. ^ a b c d e f g Simpson, J. A.; Weiner, E. S. C., eds. (1989), The Oxford English Dictionary, 2nd ed., Oxford: Clarendon Press
  6. ^ a b c Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  7. ^ The American Heritage Dictionary of the English Language (1992), 3rd ed., Boston: Houghton Mifflin

Related etymologies

Cite this entry

“Illegal.” Etymologically, 15 Oct. 2026, etymologically.com/en/illegal. Accessed 15 Oct. 2026.

Last edited on . ·