cal ‧ en ‧ dar S3 /ˈkæləndə, ˈkælɪndə $ -ər/ BrE AmE noun [countable]
[ Date: 1100-1200 ; Language: Anglo-French ; Origin: calender , from Medieval Latin kalendarium , from Latin kalendae 'first day of an ancient Roman month' ]
1 . a set of pages that show the days, weeks, and months of a particular year, that you usually hang on a wall
2 . American English
a) a book with separate spaces or pages for each day of the year, on which you write down the things you have to do SYN diary British English :
a desk calendar
b) all the things you plan to do in the next days, months etc:
an event that deserves a place on your calendar
3 . a system that divides and measures time in a particular way, usually starting from a particular event
the Roman/Islamic/Gregorian etc calendar
4 . all the events in a year that are important for a particular organization or activity
golfing/sporting/racing etc calendar
The Derby is a major event in the racing calendar.