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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

Seven people were seriously injured when they were hit by a black Suzuki Swift in Friar Gate at about 21:30 GMT on Saturday.

From BBC • 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

Next, you'll be asked if your system clock is to be set to GMT or local time.

From Debian GNU/Linux : Guide to Installation and Usage by Goerzen, John

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