the light of the moon.
pertaining to moonlight.
illuminated by moonlight.
occurring by moonlight, or at night.
verb (used without object), moonlighted, moonlighting.
to work at an additional job after one's regular, full-time employment, as at night.

1325–75; 1950–55 for def 5; Middle English monelight

moonlighter, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
moonlight (ˈmuːnˌlaɪt)
1.  Also called: moonshine light from the sun received on earth after reflection by the moon
2.  (modifier) illuminated by the moon: a moonlight walk
3.  short for moonlight flit
vb , -lights, -lighting, -lighted
4.  informal (intr) to work at a secondary job, esp at night, and often illegitimately

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

"hold a second job, especially at night," 1957 (implied in moonlighting), from moonlighter (1954), from the notion of working by the light of the moon. Related: Moonlighting. Earlier the word had been used to mean "commit crimes at night" (1882). The noun meaning "light of the moon" is attested from
mid-14c. Moonlit (1830) is first attested in Tennyson.
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

moonlight definition

  1. n.
    illicit liquor; moonshine. : Where's that bottle of moonlight you used to keep under the counter?
  2. in.
    to traffic in illicit liquor. (Best done under the cover of darkness.) : He moonlighted during prohibition.
  3. in.
    to work at a second job. : Larry had to moonlight to earn enough to feed his family.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
So sad that professors have to moonlight but clearly, this was not a good
If so, it is only because what becomes known is that a university professor
  needs to moonlight.
Most years, because of their brief duration, moonlight or cloudy conditions
  obscure the show.
We were up in the middle of the night fishing, and exploring the island by
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