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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