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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 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 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 private record 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   /ˈdaɪəri/ us   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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“diary” in Business English

Watching the detectorists
Watching the detectorists
by ,
May 31, 2016
by Colin McIntosh You could be forgiven for thinking that old-fashioned hobbies that don’t involve computers have fallen out of favour. In fact, nothing could be further from the truth. If anything, the internet has made it easier for people with specialist hobbies from different corners of the world to come together to support one another

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