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

illegal

noun
 
/ɪˈliːɡl/
 
/ɪˈliːɡl/
(especially North American English, disapproving, often offensive)
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  1. a person who lives or works in a country illegallyTopics Social issuesc2
    Word Originearly 17th cent.: from French illégal or medieval Latin illegalis, from Latin in- ‘not’ + legalis ‘according to the law’.
See illegal in the Oxford Advanced American Dictionary

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