prime meridian

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Definitions from WordNet

Noun prime meridian has 1 sense

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:

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

Adjective:

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

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