prime meridian

The prime meridian is a reference line through Greenwich, England that measures longitude east and west.

(noun)

An example of prime meridian is zero degrees longitude.

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See prime meridian in Webster's New World College Dictionary

the meridian from which longitude is measured both east and west; 0° longitude: it passes through Greenwich, England

See prime meridian in American Heritage Dictionary 4

noun
The zero meridian (0°), used as a reference line from which longitude east and west is measured. It passes through Greenwich, England.

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prime meridian

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