noun
Etymology: mean (VII)
: a fictitious moon imagined for purposes of calculation to revolve around the earth uniformly in the same period as that of the real moon
noun
Etymology: mean (VII)
: a fictitious moon imagined for purposes of calculation to revolve around the earth uniformly in the same period as that of the real moon
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012