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Definition of meridian:

  1. 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.
  2. 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.
  3. Being at, or pertaining to, midday; belonging to, or passing through, the highest point attained by the sun in his diurnal course.
  4. Hence: The highest point, as of success, prosperity, or the like; culmination.
  5. Midday; noon.
  6. Pertaining to the highest point or culmination; as, meridian splendor.


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