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1. Oxford American Dictionary

   prime meridian

   • IPA[prīm məˈridēən]

   • n.
     a planet's meridian adopted as the zero of longitude.；the earth's zero of longitude, which by convention passes through Greenwich, England.

   • noun: prime meridian, plural noun: prime meridians

2. • 更多解釋

   prime meridian

   • n.
     a planet's meridian adopted as the zero of longitude.

   Oxford Dictionary