Electromagnetic radiation in the wavelength range visible to the human eye (about 400–750 nanometers): visible light. • Electromagnetic radiation in the wavelength range visible to the human eye or in nearby ranges (infrared or ultraviolet radiation). • Electromagnetic radiation of any wavelength. • A source of illumination. • A lightbulb or similar light-emitting device, regardless of whether it is lit. • A traffic light, or (by extension) an intersection controlled by traffic lights. • Spiritual or mental illumination; enlightenment, useful information. • Facts; pieces of information; ideas, concepts. • A notable person within a specific field or discipline. • The manner in which the light strikes a picture; that part of a picture which represents those objects upon which the light is supposed to fall; the more illuminated part of a landscape or other scene; opposed to shade. • A point of view, or aspect from which a concept, person or thing is regarded. • A flame or something used to create fire. • A cigarette lighter. • A firework made by filling a case with a substance which burns brilliantly with a white or coloured flame. • A window in architecture, carriage design, or motor car design: either the opening itself or the window pane of glass that fills it, if any. • The series of squares reserved for the answer to a crossword clue. • A cross-light in a double acrostic or triple acrostic. • Open view; a visible state or condition; public observation; publicity. • The power of perception by vision: eyesight (sightedness; vision). • The brightness of the eye or eyes.