- Meridian - a town in eastern Mississippi
--1 is a kind of town
--1 is a part of Mississippi, Magnolia State, MS- meridian, longitude, 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"
--2 is a kind of great circle
--2 has particulars:observer's meridian; prime meridian; magnetic meridian; dateline, date line, International Date Line - meridian, longitude, 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"