noun \ˈka-lən-dər\

: a document, chart, etc., that shows the days, weeks, and months of a year

: a list or schedule of events or activities that occur at different times throughout the year

: a particular system for organizing the days of the year by month

Full Definition of CALENDAR

:  a system for fixing the beginning, length, and divisions of the civil year and arranging days and longer divisions of time (as weeks and months) in a definite order — see month table
:  a tabular register of days according to a system usually covering one year and referring the days of each month to the days of the week
:  an orderly list: as
a :  a list of cases to be tried in court
b :  a list of bills or other items reported out of committee for consideration by a legislative assembly
c :  a list or schedule of planned events or activities giving dates and details
British :  a university catalog

Examples of CALENDAR

  1. The university's academic calendar runs from September to May.
  2. <the calendar of upcoming events at the state fair will be available tomorrow>

Origin of CALENDAR

Middle English calender, from Anglo-French or Medieval Latin; Anglo-French kalender, from Medieval Latin kalendarium, from Latin, moneylender's account book, from kalendae calends
First Known Use: 13th century

Other Calendar Terms

antedate, estival, gloaming, luster, sesquicentennial


calendaredcalendar·ing \-d(ə-)riŋ\

Definition of CALENDAR

transitive verb
:  to enter in a calendar

First Known Use of CALENDAR

15th century


noun    (Concise Encyclopedia)

System for dividing time over extended periods, such as days, months, or years, and arranging these divisions in a definite order. A calendar is essential for the study of chronology, which reckons time by regular divisions, or periods, and uses these to date events. It is also vital for any civilization that needs to measure periods for agricultural, business, domestic, or other reasons. The lunation, or period in which the moon completes a cycle of its phases (29 days), is the basis for the month; most ancient calendars were collections of months. Days and seasons, which are a solar phenomena, do not have periods that evenly divide, so ancient calendars employed various means, such as the periodic insertion of an intercalary month, to reconcile the months with the seasons. The Gregorian calendar used almost universally today is a modification of the Julian calendar adopted by Julius Caesar, which used a 365–day year with 12 months that came to have the number of days we know today. See also calendar, Jewish; calendar, Muslim; sidereal period.


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