A rhythm method of natural birth control.

A calendar system associated with Islamic culture, dividing the year into twelve months.

plural of calendar month

plural of calendar year

plural of calendar call

plural of calendar spread

A calendar based on the movement of the Earth and the Moon around the Sun, which defines the year.

(law) A timespan of exactly 24 hours, measured from one midnight to the next. / A day having a conventional designation on a recognized calendar, such as a numerical identification within a named month.

plural of calendar day

(historical) A kind of astronomical diagram used to tell time in Ancient Egypt.