From Middle English kalender, from Old French calendier, from Latin calendarium (“account book”), from calendae (“the first day of the month”), from calare (“to announce solemnly, to call out (the sighting of the new moon)”), from Proto-Indo-European *kelh₁-.
calendar (plural calendars)
- Any system by which time is divided into days, weeks, months, and years.
- A means to determine the date consisting of a document containing dates and other temporal information.
- A list of planned events.
- An orderly list or enumeration of persons, things, or events; a schedule.
- (US) An appointment book (US), appointment diary (UK)
calendar (third-person singular simple present calendars, present participle calendaring, simple past and past participle calendared)
- (law) To set a date for a proceeding in court, usually done by a judge at a calendar call.
- To enter or write in a calendar; to register.