A book or digital document in which one keeps a daily record of events and experiences. noun
She wrote in her diary every night before going to bed.
His diary was filled with entries about his travels around the world.
A personal record of events, thoughts, or feelings, typically kept on a regular basis. noun
The diary revealed her innermost thoughts and feelings.
He kept a diary to document his journey through recovery.
A book or pad containing pages marked with the days of the week and months of the year, used for keeping a record of appointments or notes. noun
She checked her diary to confirm the date of the meeting.
He noted the appointment in his diary to ensure he wouldn't forget.