Adjective meridian has 1 sense
  1. meridian - of or happening at noon; "meridian hour"
,Noun meridian has 2 senses
  1. Meridian - a town in eastern Mississippi
    --1 is a kind of
    town
    --1 is a part of Mississippi, Magnolia State, MS
  2. 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
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