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prime meridian Definition

prime meridian

noun

the meridian from which longitude is measured both east and west; 0° longitude: it passes through Greenwich, England

prime meridian Usage Examples

Possessives

  • earth: For this is where the Earth's prime meridian, the line of zero degrees longitude, originates.

Converse of object

  • define: Azores The Island of St Mary in the Azores was used to define the prime meridian by Christopher Saxton, 1584.