Definition of illegal adjective from the Oxford Advanced Learner's Dictionary

    

illegal

 adjective
adjective
BrE BrE//ɪˈliːɡl//
 
; NAmE NAmE//ɪˈliːɡl//
 
Justice
 
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 not allowed by the law illegal immigrants/aliens It's illegal to drive through a red light. opposite legal See related entries: Justice Word Origin early 17th cent.: from French illégal or medieval Latin illegalis, from Latin in- ‘not’ + legalis ‘according to the law’.Extra examples Prize-fighting remained popular, though technically illegal, until the 1880s. Such acts are clearly illegal. The sale of these knives should be made illegal. Their action was judged illegal by the International Court. blatantly illegal counter-intelligence methods It’s illegal to drive through a red light. Most of these jobs are done by illegal immigrants.
See the Oxford Advanced American Dictionary entry: illegal

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