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English definition of “the prime meridian”

the prime meridian

noun [S]     specialized
the imaginary line from the North Pole to the South Pole that passes through Greenwich in England and markslongitude, from which all other longitudes are measuredMaps and map-makingContinents and regions of the worldCountry namesCountry and nation
(Definition of the prime meridian noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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