Illegal Definition

ĭ-lēgəl
illegals
adjective
Prohibited by law; against the law; unlawful; illicit.
Webster's New World
Not authorized or sanctioned, as by rules.
Webster's New World
Unacceptable to or not performable by a computer.
An illegal operation.
American Heritage

(philately, of an issue printed for collectors) Totally fictitious, and often issued on behalf of a non-existent territory or country.

Wiktionary

(of a person, sometimes offensive) Being or doing something illegally.

Illegal immigrant; illegal logger; illegal pilot.
Wiktionary
noun
illegals
A person who is not legally authorized to live and work in a country.
American Heritage
An alien who has entered a country illegally.
Webster's New World
(colloquial, offensive) An illegal immigrant.
Wiktionary
An illegal resident spy.
Wiktionary

Other Word Forms of Illegal

Noun

Singular:
illegal
Plural:
illegals

Origin of Illegal

  • From French illégal, from Medieval Latin illegalis. In senses relating to immigration, via clipping from illegal alien or illegal immigrant.

    From Wiktionary

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