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 New Moon

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

1. [daily life] the period when the Moon is so close to the Sun in the sky that you cannot see the Moon. The Moon is then roughly between the Sun and the Earth.
2. [astronomy] the instant of time when, as seen from Earth, the center of the Moon has the same ecliptic longitude as the center of the Sun.