Definition of prime meridian in English:

prime meridian

Syllabification: prime me·rid·i·an

noun

1A planet’s meridian adopted as the zero of longitude.
More example sentences
  • That's the instant the sun is aligned with the degree line of longitude, or the prime meridian - also called the Greenwich Meridian.
  • Zero degrees longitude, the prime meridian could be anywhere - and has been, from the designated home ports of Rome to Paris to Jerusalem to Philadelphia to St. Petersburg.
  • On the earliest charts displaying a longitude scale, the prime meridian passed through the Canaries.
1.1 (usually the prime meridian) The earth’s zero of longitude, which by convention passes through Greenwich, England. See also Greenwich meridian.
More example sentences
  • A further difficulty was the question of the position of the prime meridian.
  • On the earliest charts displaying a longitude scale, the prime meridian passed through the Canaries.
  • In case you didn't know, this city is famous for being the home of the prime meridian, hence Greenwich Mean Time.

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