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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.
Origin of new moon
before 1000; Middle English; Old English Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for new moon

new moon

the moon when it appears as a narrow waxing crescent
the time at which this occurs
(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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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new moon in Science
new moon
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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