1. a book in which you write about what happens to you each day
2. a book with separate spaces for each day of the year where you can write appointments and reminders

Examples

• She writes in her diary every night before bed.
• I found my grandmother’s old diary in the attic.
• He kept a diary during his trip to Europe.
• I wrote my dentist appointment in my diary.
• The diary helped her remember important dates.
• Anne Frank’s diary became famous around the world.
• I need to check my diary to see if I’m free on Friday.