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3 definitions found
 for Magnetic meridian
From The Collaborative International Dictionary of English v.0.48 :

  magnetic meridian \magnetic meridian\ (Physics), n.
     An imaginary line passing through both magnetic poles of the
     [WordNet 1.5]

From The Collaborative International Dictionary of English v.0.48 :

  Meridian \Me*rid"i*an\, n. [F. m['e]ridien. See Meridian, a.]
     [1913 Webster]
     1. Midday; noon.
        [1913 Webster]
     2. Hence: The highest point, as of success, prosperity, or
        the like; culmination.
        [1913 Webster]
              I have touched the highest point of all my
              And from that full meridian of my glory
              I haste now to my setting.            --Shak.
        [1913 Webster]
     3. (Astron.) A great circle of the sphere passing through the
        is crossed by the sun at midday.
        [1913 Webster]
     4. (Geog.) A great circle on the surface of the earth,
        passing through the poles and any given place; also, the
        half of such a circle included between the poles.
        [1913 Webster]
     Note: The planes of the geographical and astronomical
           meridians coincide. Meridians, on a map or globe, are
           lines drawn at certain intervals due north and south,
           or in the direction of the poles.
           [1913 Webster]
     Calculated for the meridian of, or fitted to the meridian
     of, or adapted to the meridian of, suited to the local
        circumstances, capabilities, or special requirements of.
        [1913 Webster]
              All other knowledge merely serves the concerns of
              this life, and is fitted to the meridian thereof.
                                                    --Sir M. Hale.
        [1913 Webster]
     First meridian or prime meridian, the meridian from which
        longitudes are reckoned. The meridian of Greenwich is the
        one commonly employed in calculations of longitude by
        geographers, and in actual practice, although in various
        countries other and different meridians, chiefly those
        which pass through the capitals of the countries, are
        in the United States, the meridian of Washington, etc.
     Guide meridian (Public Land Survey), a line, marked by
        monuments, running North and South through a section of
        country between other more carefully established meridians
        called principal meridians, used for reference in
        surveying. [U.S.]
     Magnetic meridian, a great circle, passing through the
        zenith and coinciding in direction with the magnetic
        needle, or a line on the earth's surface having the same
     Meridian circle (Astron.), an instrument consisting of a
        telescope attached to a large graduated circle and so
        mounted that the telescope revolves like the transit
        instrument in a meridian plane. By it the right ascension
        and the declination of a star may be measured in a single
     Meridian instrument (Astron.), any astronomical instrument
        having a telescope that rotates in a meridian plane.
     Meridian of a globe, or Brass meridian, a graduated
        circular ring of brass, in which the artificial globe is
        suspended and revolves.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  magnetic meridian
      n 1: an imaginary line passing through both magnetic poles of
           the Earth

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