prime meridian

1. 1.

   meridian at zero degree longitude from which east and west are reckoned (usually the Greenwich longitude in England)

   Broadermeridian

   NarrowerGreenwich Meridian

Questions about prime meridian

What does prime meridian mean?

prime meridian means "meridian at zero degree longitude from which east and west are reckoned (usually the Greenwich longitude in England)".

Is prime meridian a common word?

prime meridian is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.