1. astronomy : the period of about a week at the time of a new moon when the moon's light is absent from the nighttime sky
2. : a period when the moon is not shining or when it is obscured
1. astronomy : the period of about a week at the time of a new moon when the moon's light is absent from the nighttime sky
2. : a period when the moon is not shining or when it is obscured
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012