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English definition of “meridian”

meridian

noun [C] uk   /məˈrɪd.i.ən/ us  
an imaginary line from the North Pole to the South Pole, drawn on maps to help to show the position of a place: The prime meridian of longitude is in Greenwich, South London.Maps and map-makingContinents and regions of the worldCountry namesCountry and nation
(Definition of meridian from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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