Etymology
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illegal (adj.)

1630s, from French illégal (14c.) or directly from Medieval Latin illegalis, from assimilated form of in- "not, opposite of" (see in- (1)) + Latin legalis (see legal). Term illegal immigrant first recorded 1892 in American English (illegal immigration is from 1887); used in British English in 1940s in reference to the Jewish movement to Palestine.

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Definitions of illegal

illegal (adj.)
prohibited by law or by official or accepted rules;
an illegal chess move
From wordnet.princeton.edu