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The Collaborative International Dictionary

Radian \Ra"di*an\ (r[=a]"d[i^]*an), n. [From Radius.] (Math.) An arc of a circle which is equal to the radius, or the angle measured by such an arc.

Douglas Harper's Etymology Dictionary

"angle subtended at the center of a circle by an arc equal in length to the radius," 1879, from radius.


n. (context geometry English) In the International System of Units, the derived unit of plane angular measure of angle equal to the angle subtended at the centre of a circle by an arc of its circumference equal in length to the radius of the circle. Symbol: rad


n. the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees) [syn: rad]


The radian is the standard unit of angular measure, used in many areas of mathematics. The length of an arc of a unit circle is numerically equal to the measurement in radians of the angle that it subtends; one radian is just under 57.3 degrees (when the arc length is equal to the radius; expansion at ). The unit was formerly an SI supplementary unit, but this category was abolished in 1995 and the radian is now considered an SI derived unit.

Separately, the SI unit of solid angle measurement is the steradian.

The radian is represented by the symbol rad. An alternative symbol is , the superscript letter c, for "circular measure", or the letter r, but both of those symbols are infrequently used as it can be easily mistaken for a degree symbol (°) or a radius (r). So for example, a value of 1.2 radians could be written as 1.2 rad, 1.2 r, 1.2, or 1.2.

Radian (band)

Radian is an Austrian experimental music group.

Their music touches on instrumental rock, post-rock, jazz and electronica, and is notable for imitating some of the more demanding musical structures of intelligent dance music.

The trio was formed in 1996, in Vienna.

Radian (comics)

Radian, in comics, may refer to:

  • Radian (Morituri), a Marvel Comics character from Strikeforce Morituri
  • Radian, a Marvel Comics character from New X-Men
  • Radian, a Marvel Comics character from Doom 2099
Radian (Morituri)

Radian (Louis Armanetti) is a fictional character, a superhero in the Marvel Universe, member of the Strikeforce: Morituri. The character was created by Peter B. Gillis and Brent Anderson.

Radian (disambiguation)

Radian may refer to:

  • Radian, a unit of plane angle
  • Radian (band), a musical group
  • Radian (EP), an EP by Ana Free
  • Radian (comics), a number of comics characters
  • Radian Group, a credit enhancement company
  • Radian Glacier, Antarctica
  • Radian Ridge , Antarctica, see Radian Glacier
  • Yamaha YX600 Radian, a motorbike

It may also refer to a number of species:

  • Actinor radians, the Veined Dart, a butterfly
  • Agrotis radians, the Brown Cutworm
  • Euplocia radians, a moth of the Noctuidae family, now known as Euplocia membliaria
  • Helcioniscus radians flavus, a true limpet, now known as Cellana flava
  • Josia radians, a moth of the Notodontidae family
  • Miltonia spectabilis var. radians, an orchid, now known as Miltonia spectabilis
Radian (EP)

Radian is the debut EP album by Portuguese singer Ana Free. It was released on February 9, 2010, in the U.S. and its lead single was "Questions in My Mind", released a week after.

Usage examples of "radian".

She was the best ship he had ever flown, a cruiser built for battle, quick and responsive to the tack of her ambient-light sails and the tightening and loosening of her radian draws.

Twin sets of diapson crystals converted to raw energy the light funneled from the collector sails through the radian draws.

Rover crew scramble up the masts, lofting the sails and fastening the radian draws in place.

Only a handful of shipwrights understood the mechanics of ambient-light sails, radian draws, and diapson crystals well enough to build the vessels that could utilize them.

Hawken relayed the instructions to the men stationed at the front and rear parse tubes, where the crystals were fed light from the radian draws.

Alt Mer spun the wheel that guided the rudders off the parse tubes and fed power down the radian draws to the crystals in steadily increasing increments.

Alt Mer hooded the diapson crystals in response, slowing the power fed by the radian draws, giving the ship over to the wind.

Long, jagged-edge pikes and grappling hooks attached to throwing ropes were used to draw an enemy ship close enough to tear apart her sails or sever her radian draws.

A burning brand, its captainless crew was desperately trying to tie off the radian draws before power to the crystals spilled her sideways.

The mast snapped as if caught in a high wind and toppled to the deck, bringing down sails and radian draws alike.

A cluster of ships lay anchored at the north end of the cove, sleek and dark against the silvery waters, and by the glint of radian draws and the odd slant of light sheaths furled and waiting for release, Walker recognized them as airships.

As a result, they were still aboard when the warning was given, light sheaths yet unfurled, radian draws in place, and the anchor barely down.

Light energy gathered by the sheaths was relayed by lines called radian draws.

Later, he would operate the controls and rudders, drawing down power from the light sheaths or unhooding the crystals or tightening the radian draws.

He was given a chance to try his hand at almost everything, from polishing the diapson crystals to threading the radian draws.