meridiannoun [ C ]
uk/məˈrɪd.i.ən/us/məˈrɪd.i.ən/an imaginary line between the North Pole and the South Pole, drawn on maps to help to show the position of a place:
The prime meridian of longitude is in Greenwich, London.
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Maps & map-making
- cartographer
- chart
- coastline
- contour
- coordinate
- elevation
- GPS
- grid reference
- isohyet
- isoline
- isotherm
- key
- map
- os
- pt
- satnav
- the Ordnance Survey
- the prime meridian
- time zone
- triangulation
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