a small book in which you write things you must do, names and addresses, telephone numbers etc; = diary Bre
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datebookUKUS /ˈdeɪtbʊk/ noun [C] US (UKdiary)
► a book showing the days of the year, used to keep a record of the meetings you have, things you must do, people's addresses and telephone numbers, etc.: »
After April I have no projects, so my datebook is empty.