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

No arrests were made, but the agents seized cash, records detailing wagers, and ledgers and diaries with betting information. —Kori Rumore, Chicago Tribune, 21 Mar. 2025

The story follows Anna, an outcast who discovers her deceased roommate’s diary and encounters a ghostly flame embodying her spirit. —Naman Ramachandran, Variety, 19 Mar. 2025

How every sleeping positions can affect your health How to find the best sleep position for you Over the course of a few weeks, use a sleep diary to track what sleep position feels most comfortable for you, suggests McPhillips. —Caroline C. Boyle, USA TODAY, 4 Mar. 2025

Keep a Headache Diary A diary of what occurred before and during a headache can help you and your healthcare provider determine triggers and possible treatments. —Cathy Nelson, Verywell Health, 3 Mar. 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