A calendar is a system for keeping track of time.
It tells us what day it is, what month it is, and what year it is.
We use calendars to plan our days, weeks, months, and years.
I have a calendar on my wall.
Noun:
Singular: calendar.
Plural: calendars.
Adjective:
Calendar: used to describe something that is related to a calendar.
Verb:
Calendarize: to arrange or schedule something according to a calendar.
The word "calendar" comes from the Latin word "calendarium", which means "account book" or "register". The Latin word "calendarium" is derived from the word "calendae", which was the first day of the month in the Roman calendar.
Why are calendars useful?