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 of diary

• journal

Examples of diary in a Sentence

has diligently kept a diary since she was 15

Recent Examples on the Web

The original citations have been added to the permanent casefile and the casefile diary has been amended to ensure all information is included. —Preston Fore, Fortune, 12 Nov. 2025

Iasiello, a licensed real estate broker, exhaustively and cheerfully documents his work buying, rehabilitating and flipping these homes, providing daily video diaries of the work and line item breakdowns of the entire cost — and profit — associated with some of his projects. —Karen Wang, Miami Herald, 7 Nov. 2025

The organization manages an extensive collection of historic manuscripts, letters, diaries, photographs, maps, and more, all accessible to the public. —Lennie Omalza, Louisville Courier Journal, 6 Nov. 2025

The place itself, of course, but also artefacts—photographs, diaries, heirlooms. —Literary Hub, 6 Nov. 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