See under standard time.
the civil time officially adopted for a country or region, usually the civil time of some specific meridian lying within the region. The standard time zones in the U.S. (Atlantic time, Eastern time, Central time, Mountain time, Pacific time, Yukon time, Alaska-Hawaii time, and Bering time) use the civil times of the 60th, 75th, 90th, 105th, 120th, 135th, 150th, and 165th meridians respectively, the difference of time between one zone and the next being exactly one hour.
the official local time of a region or country determined by the distance from Greenwich of a line of longitude passing through the area
The time in any of the 24 time zones into which the Earth’s surface is divided, usually the mean time at the central meridian of the given zone. There are four standard time zones in the contiguous continental United States: Eastern, using the 75th meridian; Central, using the 90th meridian; Mountain, using the 105th meridian; and Pacific, using the 120th meridian. Alaska Standard Time, centered on the 135th meridian, is one hour behind Pacific time, and Hawaii Standard Time, centered on the 150th meridian, is one hour behind Alaska time. See more at daylight-saving time, time zone.
the chief wine-producing region of California, centered in San Joaquin County.
- Central vein of retina
central vein of retina n. The vein formed by union of the retinal veins and accompanying the central artery of the retina in the optic nerve.
- Central vein of suprarenal gland
central vein of suprarenal gland n. The single vein draining the adrenal gland that receives a number of medullary veins and empties on the right directly into the inferior vena cava and on the left into the left renal vein.
- Central veins of liver
central veins of liver pl.n. The terminal branches of the hepatic veins, lying centrally in the hepatic lobules and receiving blood from the liver sinusoids.