full moon

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

before 1000; Middle English ful moyne, Old English fulles monan

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World English Dictionary
full moon
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 10th Edition
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American Heritage
Science Dictionary
full moon   (fl)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Lots of people know the full moon and the crescent moon, but don't know the
  phases in between.
The sun, if visible at all, seems dimmer than the full moon on a hazy night.
After worshipping the full moon, family members would eat the cakes together.
On the night of the full moon the city opens its archaeological sites and
  monuments to the public for free.
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