Definitions of meridian

  1. 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. Highest point reached by a heavenly body; highest point, as of success, prosperty, and the like; an imaginary circle around the earth in a north and south direction, passing through the poles.
  3. Mid- day: the highest point, as of success: an imaginary circle on the earth's surface passing through the poles and any given place: ( astr.) an imaginary circle, passing through the poles of the heavens, and the zenith of the spectator, which the sun crosses at mid- day.
  4. Noon; highest point; great circle passing through the poles.
  5. Pertaining to noon or a meridian.
  6. A great circle supposed to be drawn so as to pass through the poles of the earth, and the zenith and nadir of any given place, intersecting the equator at right angles, and dividing the hemisphere into eastern and western; midday; roon; the highest point.
  7. In geog., an imaginary great circle on the surface of the earth, supposed to pass through the poles and any given place, cutting the equator at right angles; in astron., a great circle of the sphere passing through the poles of the heavens and the zenith of the spectator which is crossed at mid- day; the brass ring surrounding a globe on which the degrees are marked- meridians are so called because they mark all places that have noon at the same instant; mid- day or noon; the highest point of anything.
  8. Being at, or pertaining to, midday; belonging to, or passing through, the highest point attained by the sun in his diurnal course.
  9. Pertaining to the highest point or culmination; as, meridian splendor.
  10. Midday; noon.
  11. Hence: The highest point, as of success, prosperity, or the like; culmination.
  12. A great circle of the sphere passing through the poles of the heavens and the zenith of a given place. It is crossed by the sun at midday.
  13. 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.
  14. Meridional.
  15. Pertaining to mid- day: being on the meridian or at mid- day: raised to the highest point.
  16. Pertaining to the meridian; highest; brightest; noonday.
  17. Pertaining to the meridian or at mid- day or to the highest point, or to the magnetic meridian. Magnetic meridian, a great circle, parallel with the direction of the magnetic needle, and passing through its poles.
  18. Being on the meridian or at mid- day; pert. to the highest point.
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