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English definition of “diary”

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diary

noun [C] uk   /ˈdaɪə.ri/ us    /ˈdaɪr.i/
a book in which you record your thoughts or feelings or what has happened each day: While in hiding, Anne Frank kept a diary.A2 UK ( US datebook) 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.
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(Definition of diary from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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