prime meridian

noun

Definition of prime meridian

: the meridian of 0 degrees longitude which runs through the original site of the Royal Observatory at Greenwich, England, and from which other longitudes are reckoned

Examples of prime meridian in a Sentence

Recent Examples on the Web

Longitude measure distances from the prime meridian. Caroline Picard, Good Housekeeping, "Can You Score an A+ On This 5th Grade Geography Test?," 31 Aug. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'prime meridian.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of prime meridian

1884, in the meaning defined above

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The first known use of prime meridian was in 1884

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