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)

calendars, present (3rd person singular) calendared, past participle, past calendaring present participle

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

Derived Forms

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

Conjugated Forms

Present

• has calendared
  perfect 3rd person singular
• have calendared
  perfect
• has been calendaring
  perfect progressive 3rd person singular
• are calendaring
  progressive
• have been calendaring
  perfect progressive
• is calendaring
  progressive 3rd person singular
• am calendaring
  progressive 1st person singular
• calendars
  singular 3rd person
• calendaring
  participle

Past

• were calendaring
  progressive plural
• had calendared
  perfect
• had been calendaring
  perfect progressive
• was calendaring
  progressive singular
• calendared
  participle
• calendared
  simple

Future

• will calendar
  simple
• will have calendared
  perfect
• will have been calendaring
  perfect progressive
• will be calendaring
  progressive

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

Fidelity will let investors off the hook by day 16, but most other brokers discourage flipping for 30 calendar days.

From Barron's • Jun. 10, 2026

Newton also finds that the S&P 500 Cycle Composite — a predictive market model that combines historical seasonal and calendar trends into a single, averaged roadmap for the stock market — suggests a market downturn.

From MarketWatch • Jun. 9, 2026

The question now is how much time recovery will take, and whether the calendar can absorb it.

From BBC • Jun. 9, 2026

If I ask a bot to add stuff to my calendar, the calendar I’m referring to is Google’s, not Apple’s.

From The Wall Street Journal • Jun. 9, 2026

In the meantime two monks created a calendar without zero, damning us to eternal confusion.

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