diary Meaning in the Cambridge English Dictionary
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Meaning of “diary” in the English Dictionary

"diary" in British English

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diarynoun [C]

uk   /ˈdaɪə.ri/  us   /ˈdaɪr.i/
a ​book in which you ​recordyourthoughts or ​feelings or what has ​happened each ​day: While in ​hiding, Anne Frank kept a diary.A2 UK (US datebook) a ​book with a ​separatespace or ​page for each ​day, in which you write down ​yourfuturearrangements, ​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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"diary" in American English

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diarynoun [C]

 us   /ˈdɑɪ·ə·ri, ˈdɑɪ·ri/
a person’s ​privaterecord of ​events, ​thoughts, ​feelings, etc., that are written down every ​day, or a ​book where such things are ​recorded: That's my ​private diary - you shouldn't be ​reading it. We ​kept a food-and-exercise diary and ​measured the ​amount of ​food we ​ate.
(Definition of diary from the Cambridge Academic Content Dictionary © Cambridge University Press)

"diary" in Business English

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diarynoun [C]

uk   us   /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 ​appointmentsefficiently.
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 ​finalstages of the ​project.
(Definition of diary from the Cambridge Business English Dictionary © Cambridge University Press)
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