Longman Dictionary of Contemporary English - calendar

~ n 1 pages printed to show the days, weeks, and months of a particular year, that you hang on the wall 2 AmE 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; diary (2) BrE b) all the things you plan to do in the next days, months etc  (The President's calendar is already very full.) 3 a system for dividing time, that fixes the event from which all years are measured and arranges days into months and years  (the Gregorian calendar) 4 all the events in a year that are important for a particular organization or activity  (The Derby is a major event in the racing calendar.)