[il.le.gal] adj [MF or ML; MF illegal, fr. ML illegalis, fr. L in- + legalis legal] (1538): not according to or authorized by law: unlawful, illicit; also: not sanctioned by official rules (as of a game) -- il.le.gal.i.ty n -- il.le.gal.ly adv
[2]illegal n (1939): an illegal immigrant