new moon

the moon either when in conjunction with the sun or soon after, being either invisible or visible only as a slender crescent.
the phase of the moon at this time.

before 1000; Middle English; Old English Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
new moon
1.  the moon when it appears as a narrow waxing crescent
2.  the time at which this occurs
3.  astronomy one of the four principal phases of the moon, occurring when it lies between the earth and the sun

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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American Heritage
Science Dictionary
new moon   (n)  Pronunciation Key 
The phase of the Moon that occurs when it passes between Earth and the Sun, making it either invisible or visible only as a thin crescent at sunset. See more at moon. Compare full moon.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They cited references in the story that the day of the prophecy was a new moon,
  which would be true of an eclipse.
There would be no stillness of the moon or of the night except during the new
  moon phase.
Sleep in the light of a new moon and you may never wake up.
The new moon earlier in the week will ensure that the skies will be perfectly
  dark for the shower.
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