calendar

American  

[kal-uhn-der] / ˈkæl ən dər /

noun

1. a table or register with the days of each month and week in a year.

   He marked the date on his calendar.

2. any of various systems of reckoning time, especially with reference to the beginning, length, and divisions of the year.

3. a list or register, especially one arranged chronologically, as of appointments, work to be done, or cases to be tried in a court.

   Synonyms:

   program, schedule, diary

4. a list, in the order to be considered, of bills, resolutions, etc., brought before a legislative body.

5. Obsolete. a guide or example.

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verb (used with object)

1. to enter in a calendar; register.

calendar British  

/ kæˈlɛndrɪkəl, ˈkælɪndə /

noun

1. a system for determining the beginning, length, and order of years and their divisions See also Gregorian calendar Jewish calendar Julian calendar Revolutionary calendar Roman calendar

2. a table showing any such arrangement, esp as applied to one or more successive years

3. a list, register, or schedule of social events, pending court cases, appointments, etc

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verb

1. (tr) to enter in a calendar; schedule; register

Other Word Forms

• calendarial adjective
• calendarian adjective
• calendaric adjective
• calendric adjective
• calendrical adjective
• uncalendared adjective

Etymology

Origin of calendar

First recorded in 1175–1225; Middle English calender, from Anglo-French, from Latin calendārium “account book,” equivalent to Calend(ae) calends (when debts were due) + -ārium -ary

Explanation

A calendar is a chart that organizes the year into days, weeks or months. It's also a list of appointments or activities, like the calendar for the club that lists when the bands are playing. A calendar might hang on your refrigerator, where you can scribble your appointments on the squares. If you have something scheduled every day of the week, your calendar is full. In that case you might keep track of your dates with a calendar on your computer (or phone). Don't misspell it with an er ending, or you're referring to a machine that presses cloth. If you remember that "DAys" are in calenDArs, then you'll know to end it with a DAr.

Example Sentences

These are mean estimates among analysts polled by LSEG, adjusted by the data provided to match calendar years for companies, such as Nvidia, whose fiscal reporting periods don’t match the calendar.

From MarketWatch • Apr. 14, 2026

The authorities said Meta had 48 hours to confirm receipt of the letter and provide a detailed implementation plan to address the issues within seven calendar days.

From The Wall Street Journal • Apr. 13, 2026

My creative output felt hindered, my concert calendar stale.

From Slate • Apr. 12, 2026

Until 2021, players were honoured for performances over a calendar year, straddling two different seasons.

From BBC • Apr. 7, 2026

Along with this solar calendar, there was a ritual calendar that had 20 weeks, each of 13 days.

From "Zero: The Biography of a Dangerous Idea" by Charles Seife

Related Words

• agenda
• almanac
• card
• chronology
• diary
• docket
• journal
• lineup
• list
• program
• table
• timetable