Illegal
来自Big Physics
early 17th century: from French illégal or medieval Latin illegalis, from Latin in- ‘not’ + legalis ‘according to the law’.
wiktionary
Borrowed from French illégal, from Medieval Latin illegalis, from Latin legalis. In senses relating to immigration, via clipping from illegal alien or illegal immigrant.
etymonline
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.