meridian
(astronomy) A great circle passing through the poles of the celestial sphere and the zenith for a particular point on the Earth's surface.
(astronomy, also geography) A great circle on the Earth's surface, passing through the geographic poles (the terrestrial North Pole and South Pole); also, half of such a circle extending from pole to pole, all points of which have the same longitude.
(by extension) The place on the celestial meridian where it is crossed by the sun or a star at its highest point.
(by extension, figuratively) The highest or most developed point, or most splendid stage, of something; culmination, peak, zenith.
(by extension, figuratively) The middle period of someone's life, when they are at their full abilities or strength; one's prime.
(by extension) A ring or half-ring with markings in which an artificial globe is installed and may spin.
(by extension, mathematics) A line passing through the poles of any sphere; a notional line on the surface of a curved or round body (in particular, an eyeball).
(US, printing, dated) The size of type between double great primer and canon, standardized as 44-point.
(obsolete) The south.
(obsolete) Midday, noon.
(obsolete) A midday rest; a siesta.
"As we have," he said, "in the course of this our toilsome journey, lost our meridian, indulgence shall be given to those of our attendants who shall, from very weariness, be unable to attend the duty at prime, and this by way of misericord or indulgentia."
(obsolete) A particular area or situation considered as having a specific characteristic or identity; also, the characteristics, habits, or tastes of a specific group, locale, etc.
Diet, […] comprehends those sixe non naturall things, which I have before specified, are especiall causes, and being rectified, a sole or chiefe part of the Cure. […] Which howsoever I treat of, as proper to the Meridian of melancholy, yet neverthelesse that which is here said, will generally serve most other diseases, and ease them likewise, if it be observed.
(obsolete, Scotland) An alcoholic drink taken at midday.
To cause an object to reach the meridian or highest point of (something).
Of a celestial body: to reach its meridian.
Relating to a meridian; meridional.
(archaic except literary) Relating to midday or noon.
Daylight came at nine o'clock. At midday the sky to the south warmed to rose-color, and marked where the bulge of the earth intervened between the meridian sun and the northern world.
(obsolete) Relating to the culmination or highest point.
[I]n the meridian times of stage-coach travelling [the Buck's Head inn] had been the place where many coaches changed and kept their relays of horses.
(obsolete) Relating to the south; southern.
(acupuncture, traditional Chinese medicine) Any of the pathways on the body along which chi or qi (life force) is thought to flow and, therefore, the acupoints are distributed; especially, one of twelve such pathways associated with organs of the body.