Definition of meridian noun from the Oxford Advanced Learner's Dictionary

 

meridian

 noun
noun
BrE BrE//məˈrɪdiən//
 
; NAmE NAmE//məˈrɪdiən//
 
The Earth and the atmosphere
 
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one of the lines that is drawn from the North Pole to the South Pole on a map of the world See related entries: The Earth and the atmosphere Word Origin late Middle English: from Old French meridien, from Latin meridianum (neuter, used as a noun) ‘noon’, from medius ‘middle’ + dies ‘day’.
See the Oxford Advanced American Dictionary entry: meridian