1. • noun - the highest level or degree attainable
   • noun - a town in eastern Mississippi
   • noun - an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator
   • adj - of or happening at noon
   • adj - being at the best stage of development
2. • An imaginary great circle on the earth’s surface passing through the North and South geographic poles.
   • Either half of such a great circle from pole to pole.
   • A great circle passing through the two poles of the celestial sphere and the zenith of a given observer.
   • Mathematics.
   • A curve on a surface of revolution, formed by the intersection of the surface with a plane containing the axis of revolution.
   • A plane section of a surface of revolution containing the axis of revolution.
   • Any of the longitudinal lines or pathways on the body along which the acupuncture points are distributed.
   • Archaic.
   • The highest point in the sky reached by the sun or another celestial body; a zenith.
   • Noon.
   • The highest point or stage of development; peak: “Men come to their meridian at various periods of their lives” (John Henry Newman).
   • See median strip.
   • Of or relating to a meridian; meridional.
   • Of or at midday: the meridian hour.
   • Of, relating to, or constituting the highest point, as of development or power: the empire in its meridian period.
3. • n - a circle around the earth passing through both poles

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