Lunation
A general word for a phase point in the Moon's monthly cycle — most often used for the new moon and the full moon.
A lunation is any of the Moon's regular phase turning-points across its roughly month-long cycle around Earth, though the word gets used most often for the two extremes: the new moon, when the Sun and Moon sit together, and the full moon, when they sit directly across from each other. Each lunation is an exact instant, not a full day — the moment the Sun-Moon angle hits precisely 0 or 180 degrees. A month has exactly one of each, occasionally two new moons if the cycle lands just right against the calendar. The daily readings on this site note which lunation is nearest, and how close, since the days right around one tend to read differently than the quieter stretch in between.