## Meanings
1. A book in which you write down what happens to you each day and your private thoughts.
2. A book or app for noting appointments and things to do.
3. To write regularly in a diary or journal.

## Examples
- My roommate found my diary and read it without my permission.
- Let me check my diary to see if I'm free on Friday.
- She has been diarying every evening since the new year.

## Derived Forms
- cyberdiary
- diarial
- diarism
- diarist
- diarization
- diarize
- diarylike
- e-diary
- nondiary

## Related Forms
- diurnal
- journal

## Roots and Affixes
- Root: *dyew-
- Root: diārium

## Etymology
From Latin diārium (“a daily allowance for soldiers, in Late Latin also ‘diary’”), neuter of *diārius, from diēs (“a day”) (whence also journal). Cognate with Spanish diario (“daily; diary”).

## AI Etymology
diary comes from Latin diārium (“a daily allowance for soldiers, in Late Latin also ‘diary’”), neuter of *diārius, from diēs (“a day”) (whence also journal). Cognate with Spanish diario (“daily; diary”). The historical chain includes Proto-Indo-European *dyew-, Latin diārium. Current senses include A book in which you write down what happens to you each day and your private thoughts and A book or app for noting appointments and things to do. English relatives and later formations include cyberdiary, diarial, diarism, diurnal, journal.

## Topics
- Space, Position & Direction

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