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full moon

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noun
  1. the moon when the whole of its disk is illuminated, occurring when in opposition to the sun.
  2. the phase of the moon at this time.

Origin of full moon

before 1000; Middle English ful moyne, Old English fulles monan
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for full moon

full moon

noun
  1. one of the four phases of the moon, occurring when the earth lies between the sun and the moon so that the moon is visible as a fully illuminated disc
  2. the moon in this phase
  3. the time at which this occurs
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

full moon in Science

full moon

[ful]
  1. The phase of the Moon in which it is visible as a fully illuminated disk. This phase occurs when the Moon is on the opposite side of Earth as the Sun and is not in Earth's shadow. See more at moon. Compare new moon.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.