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1. (aviation)an aircraft landing system that uses radio signals to guide aircraft down a glide slope (giving both horizontal and vertical guidance) for landing on a runway even with low visibility
   - instrument landing system

1. A midwestern state in north-central United States
   - Illinois, Prairie State, Land of Lincoln, Ill.

Type of: American state

Part of: America, middle west, Midwest, midwestern United States, the States, U.S., U.S.A., United States, United States of America, US, USA

Encyclopedia: ILS