Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun prime_meridian

1 sense of prime meridian

Sense 1
prime meridian -- (meridian at zero degree longitude from which east and west are reckoned (usually the Greenwich longitude in England))
       => meridian, line of longitude -- (an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator; "all points on the same meridian have the same longitude")