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English definition of “diary”

diary

noun [C]     /ˈdaɪə.ri/ US  /ˈdaɪr.i/
A2 a book with a separate space or page for each day, in which you write down your future arrangements, meetings, etc.: Don't forget to write/enter the date of the meeting in your diary.Schedules and agendasLists and catalogues a book in which you record your thoughts or feelings or what has happened each day: While in hiding, Anne Frank kept a diary.
(Definition of diary noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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