noun
: the mean time of the moon's revolution in its orbit from a star back to the same star : 27 days, 7 hours, 43 minutes, 11.5 seconds of mean solar time
noun
: the mean time of the moon's revolution in its orbit from a star back to the same star : 27 days, 7 hours, 43 minutes, 11.5 seconds of mean solar time
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012