Longman Dictionary of Contemporary English homepage

illegal

1 adjective
     
il‧le‧gal1
not allowed by the law [= unlawful; ≠ legal]:
illegal activities such as prostitution and gambling
it is illegal to do something
It is illegal to sell tobacco to someone under 16.
—illegally adverb:
They entered the country illegally.
—illegality noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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