diary
n. countablen. a book where you write down your private thoughts, feelings, or things that happen each day. You can also use it to keep track of future appointments and plans.
n. a daily record of personal experiences, observations, or appointments. Often used to refer to the physical book or digital application where such entries are maintained.
I write in my diary every night before bed.
She checked her diary to see if she was free for lunch next Tuesday.
Historians often rely on a subject's private diary to understand the emotional reality of an era, as these personal accounts frequently contradict the polished narratives found in official documents.
From Latin diārium (“a daily allowance for soldiers, in Late Latin also ‘diary’”), neuter of *diārius, from diēs (“a day”) (whence also journal). Cognate with Spanish diario (“daily; diary”).
From Latin diārius.
Commonly used with the verbs 'keep' or 'write in'. In British English, it frequently refers to a calendar for appointments, whereas American English often prefers 'calendar' or 'planner' for that specific sense.