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GMT

American

Or G.M.T.

Greenwich Mean Time.

GMT British

abbreviation

Greenwich Mean Time

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Usage

What is GMT? GMT is short for Greenwich Mean Time, an international reference point for time zones.How is GMT pronounced?[ gee-em-tee ]

Compare meaning

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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The White House also said he would address the nation at 0100 GMT Thursday "to provide an important update on Iran".

From Barron's • Apr. 1, 2026

France, a key player in Lebanon, called for an urgent UN Security Council meeting, which was subsequently scheduled for Tuesday at 1400 GMT.

From Barron's • Mar. 31, 2026

Crowds took to the capital's streets from 13:00 GMT on Saturday, with placards displaying messages including "fight ignorance not immigrants" and "reject racist lies" visible.

From BBC • Mar. 28, 2026

Even in winter, when clocks were set back, they remained one hour ahead of GMT, again to maximise usable daylight and support wartime productivity.

From BBC • Mar. 27, 2026

At 00.50 GMT on December 9th 1921 Godley identified signals from 1BCG located at Greenwich, Connecticut.

From The Dawn of Amateur Radio in the U.K. and Greece: a personal view by Joly, Norman F.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023