# diff

/ˈdɪf/ (US) · CEFR C1 · Noun

Source: https://englishreference.com/word/diff
Updated: 2026-05-07

## Definition

the difference between two versions of a file or piece of code. You use this when you want to see exactly what changed in a document.

For teachers: a file or output that displays the specific differences between two versions of a data set or source code. Often used as a shorthand for 'difference' in technical contexts.

## Examples

- I need to check the diff before I save my changes.
- The developer reviewed the diff to ensure that no accidental deletions occurred during the software update.
- By analyzing the diff between the two database schemas, the administrator identified several missing columns that were causing the application to crash during the migration process.

## Usage notes

- Commonly used in technical environments; often functions as a shorthand for the 'difference' between two states or values.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.