Prime Meridian Definition

prīm
noun
The meridian from which longitude is measured both east and west; 0° longitude: it passes through Greenwich, England.
Webster's New World
The meridian passing through Greenwich, England, designated as the zero meridian (0°) by an international conference in 1884.
American Heritage

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

Wiktionary

Other Word Forms of Prime Meridian

Noun

Singular:
prime meridian
Plural:
prime meridians

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prime meridian