:Not to be confused with the Roman number III. Ill (ill) may refer to: Suffering from an illness Ill (Austria), a river in western Austria Ill (France), a river in north-eastern France Illinois, often abbreviated Ill. ILL may stand for: Illorsuit Heliport (IATA airport code), in Illorsuit, Greenland Institut Laue-Langevin, a scientific research facility in Grenoble, France Interlibrary loan, a service offered by libraries that wish to share their materials Institute of Linguists (London… (More on Ill)