noun, plural luminaries.
a celestial body, as the sun or moon.
a body, object, etc., that gives light.
a person who has attained eminence in his or her field or is an inspiration to others: one of the luminaries in the field of medical science.
of, pertaining to, or characterized by light.

1400–50; late Middle English luminarye < Medieval Latin lūmināria lamp. See luminaria Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
luminary (ˈluːmɪnərɪ)
n , pl -naries
1.  a person who enlightens or influences others
2.  a famous person
3.  literary something, such as the sun or moon, that gives off light
4.  of, involving, or characterized by light or enlightenment
[C15: via Old French, from Latin lūmināre lamp, from lūmen light]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

mid-15c., "source of (artificial) light," from M.Fr. luminarie "lamp, light," from L.L. luminare "light, torch, lamp, heavenly body," lit. "that which gives light," from L. lumen (gen. luminis) "light," related to lucere "to shine" (see light (n.)). Sense of "notable person" is first recorded 1690s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Nobody ought to be called a luminary until they've been set on fire.
Actually the neutrinos merely took a trans-dimensional path which made it
  appear super luminary.
Freddy, a luminary in the music business, lit up our lives and put a song in
  our hearts.
The significant thing about an airport is where it is, not what faded old pol
  or other local luminary it's named after.
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