diary · noun C /ˈdɑɪ.ə.ri/Full view
A2 a book in which a person writes a private record of events, thoughts, feelings, etc.
Dictionary examples:

I write down my thoughts in my diary every night.

I've kept a diary since I was a little girl.

Learner example:

The best one is a diary: my aunt gave it to me. It like it because I can write my feelings in it. (Key English Test; A2; Italian)

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