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1. A system of timekeeping that defines the beginning and length and divisions of the year
    
2. A list or register of events (appointments or social events or court cases etc)
   "I have you on my calendar for next Monday"
    
3. A tabular array of the days (usually for one year)

1. Enter into a calendar

Sounds like: calender

Derived forms: calendars, calendared, calendaring

See also: calendric

Type of: arrangement, list, listing, organisation [Brit], organization, schedule, system, table, tabular array

Encyclopedia: Calendar Calendar, Christian Calendar, Reform of the