Neomenia

·noun The time of the new moon; the beginning of the month in the lunar calendar.

neomenia
nĕŏmēnĭa, ae, f., = νεομηνία, the new moon , Tert. Idol. 14; id. adv. Marc. 1, 20; Vulg. 2 Par...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.