: a small book or calendar in which one writes planned or scheduled dates, appointments, etc.
Open my datebook to any day of the week and it's the same story: My daughter is running in a cross-country meet and my younger son is playing baseball.—Joyce Maynard
: a place on a computer or other device for entering similar information
… pull out your calendars or your digital datebook and mark Aug. 20 on your calendar because the MuckFest 5k is coming to town. —Rachel Wittrock
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!