a Greater London borough on the Thames: site of a Royal Naval College (now used as the National Maritime Museum), including Inigo Jones’ Queen’s House (1617), and of the original Royal Observatory designed by Christopher Wren (1675), accepted internationally as the prime meridian of longitude since 1884, and the basis of Greenwich Mean Time. Pop: 223 700 (2003 est). Area: 46 sq km (18 sq miles)
WordReference Random House Unabridged Dictionary of American English © 2026
Green•wich
(grin′ij, -ich, gren′- for 1, 3; gren′ich, grin′-, grēn′wich for 2),USA pronunciation n.
- Place Namesa borough in SE London, England: located on the prime meridian from which geographic longitude is measured;
formerly the site of the Royal Greenwich Observatory. 209,800. - Place Namesa town in SW Connecticut. 59,578.
- Informal TermsSee Greenwich Time.
Collins Concise English Dictionary © HarperCollins Publishers::
'Greenwich' also found in these entries (note: many are not synonyms or translations):
Astronomer Royal
- Blackheath
- British Summer Time
- East Greenwich
- Flamsteed
- G.C.T.
- GHA
- GMAT
- GMT
- GST
- GeT
- Greenwich Mean Time
- Greenwich Observatory
- Greenwich Time
- Greenwich Village
- Greenwich hour angle
- Herstmonceux
- International Date Line
- Julian Day
- Newfoundland Standard Time
- Parnassus
- Rogers
- Royal Greenwich Observatory
- Sloan
- Thornhill
- Woolwich
- eastern hemisphere
- like
- longitude
- meridian
- prime meridian
- standard time
- time
- time zone
- universal time
- universal time coordinated
- walk-down
- western hemisphere