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prime meridian
 

Definitions from WordNet

Noun prime meridian has 1 sense
  1. prime meridian - meridian at zero degree longitude from which east and west are reckoned (usually the Greenwich longitude in England)
    --1 is a kind of     meridian, longitude, line of longitude

Definitions from the Web

Prime Meridian

A prime meridian is an imaginary line that represents 0° longitude and divides the Earth into Eastern and Western hemispheres.

Examples:

Noun:

  1. The Prime Meridian passes through the Royal Observatory in Greenwich, London.
  2. When we crossed the Prime Meridian, we officially entered the Western Hemisphere.

Adjective:

  1. The Prime Meridian location has historical significance for navigational purposes.
  2. Many time zones are based on the Prime Meridian.

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