noun: Often with initial capital: the first day of a month
noun: (historical, Ancient Rome) the first day of a month of the Roman calendar.
noun: (by extension) A day for settling debts and other accounts.
noun: (by extension, biblical, Judaism, obsolete) Synonym of Rosh Hodesh (“the Jewish festival of the new moon, which begins the months of the Hebrew calendar”)
noun: (rare) Synonym of calendar; (figuratively) an account, a record.
noun: (figuratively, obsolete) The first day of something; a beginning.
