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Greenwich Mean Time ( GMT ), the name for mean solar time of the longitude (0°) of the Royal Greenwich Observatory in England. The meridian at this longitude is called the prime meridian or Greenwich meridian. GMT Full Form in Dentistry In dentistry, gingival marginal trimming ( GMT ) is a procedure that involves removing excess gum tissue from around the margins of a tooth. GMT Full Form Greenwich Mean Time or Greenwich Meridian Time Greenwich Mean Time is a global time standard also known as Greenwich Meridian Time or mean solar time in Greenwich. Greenwich Meridian is a place in United Kingdom and it is the starting point for calculating longitude. GMT stands for Greenwich Mean Time, the local mean time at the Royal Observatory in Greenwich, London. It is also used as a name for the time zone UTC+00:00 and the basis for civil time in the UK.