English Reference
Noun

diff

n. countable
C1 Advanced US /ˈdɪf/ diff Computing Mathematics Medicine

n.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.

n.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.


SIMPLE

I need to check the diff before I save my changes.

CONTEXTUAL

The developer reviewed the diff to ensure that no accidental deletions occurred during the software update.

COMPLEX

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

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

More specifically, if a mid-level developer actually looked at the diff between the previous and new version of that package, would they be able to spot the malicious code?

Ars Technica· 12 Aug 2026
This entry
Level C1 · Advanced
Frequency Frequent
Updated