Astronomy Answers
From the Astronomical Dictionary

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The description of the word you requested from the astronomical dictionary is given below.

the Full Moon

The Full Moon is a phase of the Moon, equal to

1. [daily life] the period when the whole disk of the Moon seems to be illuminated, about two weeks after New Moon.
2. [astronomy] the instant at which the ecliptic longitude of the center of the Moon is exactly 180 degrees greater than that of the center of the Sun.