n. 日记（本）; 记事簿
A diary is a book which has a separate space for each day of the year. You use a diary to write down things you plan to do, or to record what happens in your life day by day.
1. a daily written record of (usually personal) experiences and observations
2. a personal journal (as a physical object)
Has anyone ever wept in your diary?
She entered all the events of the day in her diary.
The best way to master English composition is to keep a diary in English.
Her diary recorded the tyrannies of the invaders.
His diary is much cry and little wool.