/ ɪˈliːgl; NAmE / adjective , noun
■ adjective
not allowed by the law :
illegal immigrants / aliens
It's illegal to drive through a red light.
OPP legal
► il·legal·ly / -gəli; NAmE / adverb :
an illegally parked car
He entered the country illegally.
■ noun
( NAmE ) a person who lives or works in a country illegally
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WORD ORIGIN
early 17th cent.: from French illégal or medieval Latin illegalis , from Latin in- not + legalis according to the law.