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English definition of “diary”

diary

noun [C]  /ˈdɑɪ·ə·ri, ˈdɑɪ·ri/ us  
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)
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