of or pertaining to the moon: the lunar orbit.
measured by the moon's revolutions: a lunar month.
resembling the moon; round or crescent-shaped.
of or pertaining to silver.
a lunar observation taken for purposes of navigation or mapping.

1585–95; < Latin lūnāris of the moon. See Luna, -ar1

unlunar, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lunar (ˈluːnə)
1.  of or relating to the moon
2.  occurring on, used on, or designed to land on the surface of the moon: lunar module
3.  relating to, caused by, or measured by the position or orbital motion of the moon
4.  of or containing silver
[C17: from Latin lūnāris, from lūna the moon]

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

"pertaining to the moon," 1620s, from O.Fr. lunaire, from L. lunaris "of the moon," from luna "moon," (with capital L-) "moon goddess"); see luna.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

lunar lu·nar (lōō'nər)

  1. Relating to the moon or to a month.

  2. Lunate.

  3. Containing silver.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
lunar   (l'nər)  Pronunciation Key 
  1. Relating to the Moon.

  2. Measured by the revolution of the Moon around the Earth.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
And people watched around the world, drawing comparisons between the first
  lunar landing and the mining rescue.
But lunar science, and lots of it, is what they are going to get.
Lunar eclipses are much more common than solar eclipses, and many more people
  can see them at the same time.
Mysterious lunar flashes match up geographically with puffs of radon gas.
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