Greenwich Time
noun
the time as measured on the prime meridian running through Greenwich, England: used in England and as a standard of calculation elsewhere.
Origin of Greenwich Time
First recorded in 1840–50
British Dictionary definitions for greenwich mean time
Greenwich Mean Time
Greenwich Time
noun
mean solar time on the 0° meridian passing through Greenwich, England, measured from midnight: formerly a standard time in Britain and a basis for calculating times throughout most of the world, it has been replaced by an atomic timescale
Abbreviation: GMT See universal time
usage for Greenwich Mean Time
The name
Greenwich mean time is ambiguous, having been measured from mean midday in astronomy up to 1925, and is not used for scientific purposes. It is generally and incorrectly used in the sense of
universal coordinated time, an atomic timescale available since 1972 from broadcast signals, in addition to the earliest sense of
universal time, adopted internationally in 1928 as the name for GMT measured from midnight
Scientific definitions for greenwich mean time
Greenwich Mean Time
[ grĕn′ĭch ]
See universal time.