What is the meaning of Calends?

Often with initial capital: the first day of a month.

The first day of a month of the Roman calendar.

A day for settling debts and other accounts.

Synonym of Rosh Hodesh (the Jewish festival of the new moon, which begins the months of the Hebrew calendar)

Synonym of calendar; an account, a record.

The first day of something; a beginning.

plural of calend

Source: wiktionary.org