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

• journal

Examples of diary in a Sentence

has diligently kept a diary since she was 15

Recent Examples on the Web

Other than the online diary, Gendron reportedly received weapons tips in another Discord server where members mostly discussed guns and tactical gear. —Mia Cathell, The Washington Examiner, 18 Sep. 2025

In an exclusive photo diary shared with People, the Secret Lives of Mormon Wives star offers a glimpse into her first week of rehearsals, glam sessions, and family moments leading up to the live premiere. —Amanda Castro, MSNBC Newsweek, 17 Sep. 2025

Those specifics sit alongside her discovery of Samantha’s diary, where Raquel engages themes that Samantha also faced – like adoption and advocacy – showing how cultural pride and historical awareness can strengthen each other across generations. —Angela Andaloro, PEOPLE, 17 Sep. 2025

The Manhattan district attorney’s office quoted extensively from Mangione’s handwritten diary in a court filing seeking to uphold his state murder charges. —Preston Fore, Fortune, 16 Sep. 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