[rey-dee-uh ns] /ˈreɪ di əns/
brightness or light:
the radiance of the tropical sun.
warm, cheerful brightness:
the radiance of her expression.
noun (pl) -ances, -ancies
the quality or state of being radiant
a measure of the amount of electromagnetic radiation leaving or arriving at a point on a surface. It is the radiant intensity in a given direction of a small element of surface area divided by the orthogonal projection of this area onto a plane at right angles to the direction Le
c.1600, “brilliant light,” from radiant or else from Medieval Latin radiantia “brightness,” from radiare “to beam, shine” (see radiation). Figurative use from 1761. Related: Radiancy.
radiance ra·di·ance (rā’dē-əns) or ra·di·an·cy (-ən-sē)
[rey-dee-uh n-see] /ˈreɪ di ən si/ noun, plural radiancies. 1. .
- Radiant efficiency
noun 1. the ratio of the power emitted by a source of radiation to the power consumed by it ηe
noun, Optics. 1. radiant flux emitted per unit area.
noun, Physics. 1. energy transmitted in wave motion, especially electromagnetic wave motion. 2. 1 (def 2a). noun 1. energy that is emitted or propagated in the form of particles or electromagnetic radiation. It is measured in joules Qe radiant energy Energy in the form of waves, especially electromagnetic waves. Radio waves, x-rays, and visible light […]