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meridian

noun [C]
 
 
/məˈrɪd.i.ən/

Definition

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 noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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