Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

English definition of “illegal”

illegal

adjective    /ɪˈli·ɡəl/
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    /ɪˈli·ɡə·li/ adverb illegally obtained passports
(Definition of illegal adjective from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of illegal

Browse related topics

You are looking at an entry to do with Legal & illegal, but you might be interested in these topics from the Law and the police topic area:

Definitions of “illegal” in other dictionaries

Word of the Day

limber up

to do gentle exercises to stretch the muscles in order to prepare the body for more active physical exercise

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More