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English definition of “diary”

diary

noun [C]     /ˈdaɪəri/ (plural diaries)
UK ( US calendar) WORKPLACE a book or piece of software with a space or page for each day , in which you record future arrangements , meetings , etc.: in sb's diary Is there anything in your diary for tomorrow afternoon ? Please check the appointments diary before scheduling a meeting . She has a very full diary this week but she could see you next week . Our CEO is seeking a part-time diary secretary to help him manage his appointments efficiently .
a record of what has happened during a period of time : It may help to keep a diary of problems you encounter . His diary entries for July describe the final stages of the project .
(Definition of diary noun from the Cambridge Business English Dictionary © Cambridge University Press)
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