- The definition of meridian is at midday or the greatest or highest point.
- An example of meridian used as an adjective is in the phrase a "meridian activity" which means something that is done at noon.
- An example of meridian used as an adjective is in the phrase a "meridian accomplishment" which means the best accomplishment.
- A meridian is defined as a large imaginary circle that passes through two poles, particularly on a globe, or the highest stage of development.
- An example of a meridian is the Prime Meridian.
- An example of a meridian is the height of a civilization.
- of or at noon
- of or passing through the highest point in the daily course of any celestial body
- of or at the highest point of prosperity, splendor, power, etc.
- of or along a meridian
- Rare southern
Origin of meridianOld French meridien ; from Classical Latin meridianus, of noon, southern ; from meridies, noon, the south ; from older medidies ; from medius, mid + dies, day: see deity
- Archaic the highest apparent point reached by a celestial body in its course
- the highest point of power, prosperity, splendor, etc.; zenith; apex
- the middle period of one's life, regarded as the highest point of health, vigor, etc.; prime
- Obs. noon
- Astron. a great circle passing through the celestial poles, the observer's zenith and nadir, and the horizon's north and south pointsalso called celestial meridian
- a great circle of the earth passing through the geographical poles and any given point on the earth's surface
- either half of such a circle between the poles
- any of the lines of longitude running north and south on a globe or map, representing such a half circle
- Archaic distinctive character as of a particular place
- a. An imaginary great circle on the earth's surface passing through the North and South geographic poles.b. Either half of such a great circle from pole to pole. All points on the same meridian have the same longitude.
- Astronomy A great circle passing through the two poles of the celestial sphere and the zenith of a given observer. Also called celestial meridian, local meridian, vertical circle.
- Mathematics a. A curve on a surface of revolution, formed by the intersection of the surface with a plane containing the axis of revolution.b. 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 a. The highest point in the sky reached by the sun or another celestial body; a zenith.b. The time at which the sun reaches its highest point in the sky; noon.
- The highest point or stage of development; peak: “Men come to their meridian at various periods of their lives” (John Henry Newman).
- Midwestern US See median.
- 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.
Origin of meridianMiddle English, from Old French, midday, from Latin mer&imacron;dianus, of midday, from mer&imacron;di&emacron;s, midday, from mer&imacron;di&emacron;, at midday, alteration of earlier *med&imacron;di&emacron;, from *mediei di&emacron; : *mediei, dative (locative) of medius, middle; see medhyo- in Indo-European roots + di&emacron;, dative of di&emacron;s, day; see dyeu- in Indo-European roots.
- An imaginary great circle on the Earth's surface, passing through the geographic poles.
- Either half of such a great circle, all points of which have the same longitude.
- (astronomy) A great circle passing through the poles of the celestial sphere and the zenith for a particular observer.
- (mathematics) A similar line on any general surface of revolution.
- (alternative medicine) Any of the pathways on the body along which the vital energy is thought to flow and, therefore, the acupoints are distributed.
- The highest point or state of consciousness and enlightenment achievable by a human.
From Middle English, from Old French, from Latin meridianus (“of or belonging to midday or to the south, southern"), from meridies (“midday, the south"), originally *medidies, from medius (“middle") + diÄ“s (“day").