neomenia
/ˌnɪə(ʊ)ˈmiːnɪə/Ancient History. Now rare
noun
In ancient Greek and Jewish history: the time of the new moon, the beginning of the lunar month.
Origin
Late Middle English; earliest use found in John Trevisa (c1342–?1402), translator. From post-classical Latin neomenia new moon, beginning of the month, festival of the Jews (Vulgate) from ancient Greek νεομηνία (Attic νουμηνία) new moon, beginning of the month from νεο- + μήνη moon + -ία.