A2 a printed table showing all the days, weeks, and months of the year:
An old calendar for 2012 was still hanging on the wall of her office.
US a book with a separate space or page for each day, in which you write down your future arrangements, meetings, etc.:
He wrote the date of the meeting in his calendar.
the system used to measure and arrange the days, weeks, months, and special events of the year according to a belief system or tradition:
the Christian/Jewish/Chinese calendar
a list of events and dates within a particular year that are important for an organization or for the people involved in a particular activity:
the political/school calendar