Illegal meaning

ĭ-lē'gəl
Forbidden by established rules.

Moving a pawn backward is an illegal move in chess.

adjective
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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.

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.

adjective
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Prohibited by law.
adjective
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Prohibited by official rules.

An illegal pass in football.

adjective
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Unacceptable to or not performable by a computer.

An illegal operation.

adjective
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A person who is not legally authorized to live and work in a country.
noun
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Prohibited by law; against the law; unlawful; illicit.
adjective
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Not authorized or sanctioned, as by rules.
adjective
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An alien who has entered a country illegally.
noun
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Not valid. Not authorized. See illegal operation.
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Contrary to or forbidden by law, especially criminal law.

This is illegal, you know!

adjective
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(philately, of an issue printed for collectors) Totally fictitious, and often issued on behalf of a non-existent territory or country.
adjective
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(of a person, sometimes offensive) Being or doing something illegally.
  • (chiefly US, sometimes offensive) Being an illegal immigrant; residing in a country illegally.

Illegal immigrant; illegal logger; illegal pilot.

adjective
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(colloquial, offensive) An illegal immigrant.
noun
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An illegal resident spy.
noun
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Origin of illegal

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