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meridian noun

  /məˈɹɪ.di.ən/ , /məˈɹɪ.dɪ.ən/ , /mɪ-/
  • (also, geography) In full terrestrial meridian: a great circle on the Earth's surface, passing through the geographic poles (the terrestrial North Pole and South Pole); also, half of such a circle extending from pole to pole, all points of which have the same longitude. [from 14th c.]
 meridiaan
prime meridian
nulmeridiaan
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