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Definition of Greenwich mean time
1. Noun. The local time at the 0 meridian passing through Greenwich, England; it is the same everywhere.
Exact synonyms: Gmt, Greenwich Time, Universal Time, Ut, Ut1
Generic synonyms: Time
Specialized synonyms: Coordinated Universal Time, Utc
Generic synonyms: Time
Specialized synonyms: Coordinated Universal Time, Utc
Definition of Greenwich mean time
1. Proper noun. Mean solar time at the Greenwich Meridian. ¹
¹ Source: wiktionary.com