Astronomy Answers: From the Astronomical Dictionary
The description of the word you requested from the astronomical dictionary is given
the Full Moon
The Full Moon is a phase of the Moon, equal to
- [daily life] the period when the whole disk of the Moon seems to
be illuminated, about two weeks after New Moon.
- [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.