(2) A source of illumination, e.g. a lamp or an electric lighting fixture.
(3) The sensation of perceiving light.
To illuminate or to provide illumination; to ignite; to give out or fill with light.
(1) Characterized by light (illumination).
(2) Not dark in color; fair.
(4) Applying slight force or pressure.
Certain organisms are capable of producing and emitting visible radiation. Examples of such organisms are fireflies, glow worms, Jack O'Lantern mushroom, ghost fungus, Anglerfish, Aequorea victoria (a jellyfish), dinoflagellates, etc.
See also: wavelength