Illumination

The stage of incubation is often ended by a rapid insight or series of insights. These produce the "Aha!" experience, often depicted in cartoons as a light bulb appearing over the thinker's head. [Coon, Dennis. Introduction to Psychology, Exploration and Application. St. Paul: West Publishing Company, 1989. Chapter: Learning & Cognition]

R  E  F  E  R  E  N  C  E  S 

2 Illuminate vt [ME fr. L illuminatus, pp. of illuminare, fr. in- + luminare to light up, fr. lumin-, lumen light - more at Luminary] [15c] 1a: to enlighten spiritually or intellectually b [1]: to supply or brighten with light [2]: to make luminous or shining c: archaic: to set a light d: to subject to radiation 2: to make clear: Elucidate 3: to make illustrious or resplendent 4: to decorate [as a manuscript] with gold or silver or brilliant colors or with often elaborate designs or miniature pictures

3 Illuminate n [1600] archaic: one having or claiming unusual enlightenment

Illumination n [14c] 1: the action of illuminating or state of being illuminated: as a: spiritual or intellectual enlightenment b [1]: a lighting up [2]: decorative lighting or lighting effects c: decoration by the art of illuminating 2: the luminous flux per unit area on an intercepting surface at any given point 3: one of the decorative features used in the art of illuminating or in decorative lighting