# regression testing

CEFR C1 · Compound

Source: https://englishreference.com/word/regression-testing
Updated: 2026-07-22

## Definition

a way of checking that new changes to a computer program haven't broken any parts that used to work correctly. You do this after fixing a bug or adding a new feature.

For teachers: a type of software testing that verifies that recent code changes have not adversely affected existing functional or non-functional features. It ensures that the software has not regressed to a previous, less stable state after modifications.

## Examples

- We need to run regression testing before we release the update.
- After the developers patched the security flaw, the QA team performed regression testing to ensure the login system still worked perfectly.
- Automated regression testing suites are essential in continuous integration environments, as they allow teams to detect unintended side effects of code commits immediately without manual intervention.

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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.