Definition of diary noun from the Oxford Advanced American Dictionary

  

diary

 noun
noun
NAmE//ˈdaɪəri//
 
(pl. diaries)
 
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a book in which you can write down the experiences you have each day, your private thoughts, etc. Do you keep a diary (= write in one regularly)? The writer's letters and diaries are being published next year. see also journal, video diary Which Word?agenda / diary / schedule A book with a space for each day where you write down things that you have to do in the future is called a planner or a datebook (not an agenda). You may also have a calendar on your desk or hanging up in your room, where you write down your appointments. A diary or a journal is also the record that some people keep of what has happened during the day:The Diary of Anne Frank. Your schedule is a plan that lists all the work that you have to do and when you must do each thing, or it is a list showing the fixed times at which events will happen:a schedule of events for the conference
See the Oxford Advanced Learner's Dictionary entry: diary