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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 from the Cambridge Business English Dictionary © Cambridge University Press)
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