I. (ˌ)i(l)-ˈlē-gəl adjective
Etymology: Middle French or Medieval Latin; Middle French illegal, from Medieval Latin illegalis, from Latin in- + legalis legal
Date: 1538
: not according to or authorized by law : unlawful , illicit ; also : not sanctioned by official rules (as of a game)
• il·le·gal·i·ty ˌi-li-ˈga-lə-tē noun
• il·le·gal·ly (ˌ)i(l)-ˈlē-gə-lē adverb
II. noun
Date: 1939
: an illegal immigrant