Diary Definition

dīə-rē
diaries
noun
diaries
A daily written record, esp. of the writer's own experiences, thoughts, etc.
Webster's New World
A daily record of events or measurable phenomena, usually kept to track patterns over time.
Kept a diary of blood sugar levels.
American Heritage
A book for keeping such a record.
Webster's New World

(UK, Canada) A calendar or appointment book.

Wiktionary
adjective

(obsolete) Lasting for one day.

Wiktionary
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Other Word Forms of Diary

Noun

Singular:
diary
Plural:
diaries

Origin of Diary

  • From Latin diārium (“a daily allowance for soldiers, Late Latin also a diary”), neuter of * diarius, from dies (“a day”).

    From Wiktionary

  • Latin diārium daily allowance, daily journal from diēs day dyeu- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

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