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illegal

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The definition of illegal is a person not permitted to be in a country or an act that is against the law.

(adjective)

An example of illegal as an adjective is the phrase an illegal person, who is someone who is still in the United States after their tourist visa has run out.
An example of illegal as an adjective is the phrase an illegal act, which is an act such as armed robbery.

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See illegal in Webster's New World College Dictionary

adjective

prohibited by law; against the law; unlawful; illicit; also, not authorized or sanctioned, as by rules

Origin: < Fr illégal or ML illegalis: see in- & legal

noun

an alien who has entered a country illegally

Related Forms:

illegality noun pl. illegalities
illegally adverb

See illegal in American Heritage Dictionary 4

adjective

Prohibited by law.
Prohibited by official rules: an illegal pass in football.
Unacceptable to or not performable by a computer: an illegal operation.

noun

An illegal immigrant.

Related Forms:

il·leˈgal·ly adverb

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