prime meridian

prime meridian (plural prime meridians)

1. The reference line at 0° longitude, passing through Greenwich, England, from which longitude east and west is measured.

   Synonyms: Greenwich meridian, zero meridian

   Coordinate term: antimeridian

   • 2017, Charles W. J. Withers, Zero Degrees: Geographies of the Prime Meridian, Harvard University Press, →ISBN, page 183:

     Other prime meridians were presented as candidates for the world's baseline: Jerusalem; Ferro; Kamchatka; the mid-Atlantic; the Bering Strait; and Greenwich's antimeridian.