Bedeutung von “illegal” — Learner’s Dictionary

illegal

adjective us uk /ɪˈliːɡəl/
the illegal practice of copying CDsthe illegal purchase of gunsBoth men admitted taking illegal drugs.It's illegal to buy alcohol until you're 21 in many states.Police raided the house and found illegal weapons.

B2 not allowed by law:

illegal drugs/weapons
[ + to do sth ] It is illegal to sell cigarettes to anyone under 16.
illegally adverb

B2

an illegally parked car

(Definition von “illegal” aus dem Cambridge Learner's Dictionary © Cambridge University Press)