ETYM Pref. il- not + legal: cf. French illégal.
Prohibited by law or by official or accepted rules.
1. Illicite.
2. Irrégulier.
1. Illicite.
2. Irrégulier.
1. Illicite.
2. Irrégulier.
Not allowed, or leading to invalid results. For example, an illegal character in a word processing program would be one that the program cannot recognize; an illegal operation might be impossible for a program or system because of built-in constraints. Compare invalid.
Množina: illegals
An illegal immigrant.