calendar

The word “calendar” means a system for dividing time into days, months, and years. In plain terms, a tool or system for tracking days, dates, and scheduled events.

“Calendar” is pronounced KAL-uhn-duh (/ˈkæl.ən.dɚ/ in IPA).

Here is “calendar” used in a sentence: “The Gregorian calendar is used in most of the world today.”

Depending on how it is used, “calendar” can be a noun and a verb.

The word “calendar” comes from Latin. From Old French calendier, from Latin calendarium ("account book"), from calendae, the first day of the Roman month when debts were due.

“Calendar” is a fairly common word in modern English, usually learned at around the A2 level.

“Calendar” has 4 distinct senses listed in this dictionary. The most common is: a system for dividing time into days, months, and years.

A calendar shows the days, weeks, and months and is used mainly to see dates and mark events, while a diary or planner provides space to write detailed notes and appointments for each day. A calendar gives the overview; a diary records the detail.

A calendar displays the days of a year with dates and events marked, whereas an agenda is a list of items to be discussed at a specific meeting. The calendar organizes time broadly; the agenda organizes a single event.

The word for tracking dates is spelled "calendar," ending in "-ar." "Calender" with an "-er" is a rare, unrelated word for a machine that presses paper or cloth, so for dates and schedules "calendar" is always correct.

Both are systems for dividing time into days, months, and years, but the Gregorian calendar, now used worldwide, refines the leap-year rule to stay closely aligned with the solar year, while the older Julian calendar adds a leap day every four years without exception. This small difference caused the two systems to drift apart over centuries.