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English definition of “illegal”

illegal

adjective  /ɪˈli·ɡəl/ us  
against the law: Fireworks are illegal in many places. illegal immigrant/alien An illegal immigrant/alien is a person who has entered a country without government permission.
illegally
adverb  /ɪˈli·ɡə·li/ us  
illegally obtained passports
(Definition of illegal from the Cambridge Academic Content Dictionary © Cambridge University Press)
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