1. [ adjective ] of or happening at noon

"meridian hour"

Related terms: noon
2. [ noun ] (government,geography) a town in eastern Mississippi
Related terms: town Mississippi
3. [ noun ] (geography) an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator
Synonyms: longitude line_of_longitude

"all points on the same meridian have the same longitude"

Related terms: great_circle magnetic_meridian prime_meridian dateline observer's_meridian
Similar spelling:   meridional