Plain English Meaning
It's the four-letter code for Chicago O'Hare Airport. The 'K' tells you it's a U.S. airport, and 'ORD' is O'Hare's familiar three-letter code.
Full Definition
KORD is the four-letter ICAO airport identifier for Chicago O'Hare International Airport in Illinois, USA. The leading 'K' designates an airport in the contiguous United States under the ICAO identifier system, and 'ORD' is the airport's three-letter IATA/FAA code. KORD is used in flight plans, ATC computer systems, charts, and international flight planning documentation.
Context Anchor
Seen on instrument procedure charts, airport information pages, flight plans, weather reports, and displays when the airport being identified is Chicago O’Hare.