diary

noun

di·​a·​ry ˈdī-(ə-)rē 

plural diaries

1

: a record of events, transactions, or observations kept daily or at frequent intervals : journal

especially : a daily record of personal activities, reflections, or feelings

2

: a book intended or used for a diary

Synonyms

• daybook
• journal

Examples of diary in a Sentence

has diligently kept a diary since she was 15

Recent Examples on the Web

But the heart of the film lies in his writings — letters, diaries and poems, most of which were found on his body. —Lise Pedersen, Variety, 11 Apr. 2025

After the diary room, Rourke returned to the group and pulled Siwa aside to apologize. —Lauren Huff, EW.com, 10 Apr. 2025

There are Gen Zers who love to pack repertory screenings, storm Letterboxd with their film diaries and test the limits of their AMC Stubs A-List subscriptions. —Ryan Faughnder, Los Angeles Times, 8 Apr. 2025

Its tactics allegedly include limiting who the participants are allowed to contact, monitoring their calls and personal diary entries and even keeping them inside the headquarters by armed guards, per the outlet. —Jordana Comiter, People.com, 2 Apr. 2025

Word History

Etymology

Latin diarium, from dies day — more at deity

First Known Use

1581, in the meaning defined at sense 1

Phrases Containing diary

• keep a diary

Rhymes for diary

• fiery
• friary
• priory

Kids Definition

diary

noun

di·​a·​ry ˈdī-(ə-)rē 

plural diaries

: a daily record especially of personal experiences and thoughts

also : a book for keeping such a record

Etymology

from Latin diarium "a record of business dealings or activities during the day," from dies "day" — related to meridian, sunday see Word History at sunday