Sometimes, illuminations. an entertainment, display, or celebration using lights as a major feature or decoration.
intellectual or spiritual enlightenment.
Also called illuminance, intensity of illumination. Optics. the intensity of light falling at a given place on a lighted surface; the luminous flux incident per unit area, expressed in lumens per unit of area.
a supply of light:
a source of illumination.
decoration of a manuscript or book with a painted design in color, gold, etc.
Word Origin and History for in tensity of illumination
mid-14c., "spiritual enlightenment," from O.Fr. illumination, from L. illuminationem (nom. illuminatio), from illuminare "to throw into light," from in- "in" (with assimilation of -n- to the following consonant) + lumen (gen. luminis) "light." Meaning "the action of lighting" is from 1560s. Illuminate (M.E. enlumyen) originally meant "decorate written material with gold, silver, bright colors;" sense of "shining light on" first recorded 1560s. (Illumine in this sense is from late 14c.)