the prime meridian Meaning in the Cambridge English Dictionary
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Meaning of “the prime meridian” in the English Dictionary

"the prime meridian" in British English

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the prime meridiannoun [S]

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the ​imaginaryline from the ​NorthPole to the ​SouthPole that ​passes through Greenwich in ​England and ​markslongitude, from which all other longitudes are ​measured
(Definition of the prime meridian from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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