GMT
n. uncountablen. Stands for Greenwich Mean Time. The standard time in the UK and some other countries during the winter. It is used as a base to calculate time in different parts of the world.
n. Abbreviation for Greenwich Mean Time. The mean solar time at the Royal Observatory in Greenwich, London, used as a primary time standard. Often serves as a reference point for coordinating international schedules and scientific data.
The meeting starts at 10:00 AM GMT.
International flight schedules are often listed in GMT to avoid confusion between different time zones.
While UTC has largely replaced it for high-precision scientific applications, GMT remains the legal basis for civil time in the United Kingdom and several other nations during the winter months.
Usually functions as a proper noun and is often used without an article when specifying a time.
Last updated May 10, 2026