The Negative Prefix il-

From a reader commenting on the illegal alien post:

I used to hear from my history teacher in high school that the word “illegal” isn’t actually a word. I never followed up on that notion, but I suppose from popular usage, “illegal” has become legitimized. Do you have any etymological info on that?

The word illegal with the sense of “not legal or lawful” has been in English since 1626. Similar words existed in Middle English and French as early as the fourteenth century.

The expression illegal immigrant dates from 1939 during the British mandate in Palestine. The term was applied to Jews who entered Palestine without authorization.

The word illegal derives ultimately from Latin: legalis “legal” with the negative prefix in-. The n of the prefix assimilates to l in words that begin with l:

illegal: not legal or lawful

illegible: not legible; incapable of being read

illegitimate: not recognized by law as lawful offspring; not rightly deduced; departing from the expected

illiberal: not liberal; not generous; not broad-minded

illicit: not permitted; not allowed

illimitable: not capable of being limited or bounded

illiterate: unable to read or write

illogical: not logical; contrary to logic

Got Your Free eBook?


  • Subscribe to Daily Writing Tips and you will be able to download our free ebook: Basic English Grammar.
  • You will also get all our grammar, spelling, punctuation and writing tips.
  • The download link will go along with the first email (you might need to wait up to 24 hours).

3 Responses to “The Negative Prefix il-”

  1. Klepto on October 30, 2009 2:14 pm

    I’ve always wondered about the il- words. Thanks. :)

  2. Alan on October 30, 2009 5:55 pm

    A minor nit, but if it’s a prefix, shouldn’t the hyphen in the title follow the prefix, not precede it (which it should for a suffix)?

  3. Maeve on October 30, 2009 10:38 pm

    Alan,
    Quite right. I’ll fix it.
    Thanks.

Got something to say?





Recent Articles