luminary (n.) Look up luminary at
mid-15c., "lamp, light-giver, source of light," from Old French luminarie (12c.), "lamp, lights, lighting; candles; brightness, illumination," from Late Latin luminare "light, torch, lamp, heavenly body," literally "that which gives light," from Latin lumen (genitive luminis) "light, source of light, daylight, the light of the eye; distinguished person, ornament, glory," related to lucere "to shine" (see light (n.)).

From late 15c. as "celestial body." Sense of "notable person" is first recorded 1690s, though the Middle English word also had a figurative sense of "source of spiritual light, example of holiness" (mid-15c.). As an adjective, "pertaining to light," from 1794 but this is rare.