Testing & QA

Regression

/rɪˈɡreʃən/

Definition

A bug where previously working functionality breaks after a code change — caught by regression tests.

Example in context

"The new login flow introduced a regression — existing users with SSO couldn't log in after the update."

Related terms

Practice this term

Master Regression in context by working through exercises in the Testing & QA module. You'll see the term used in real engineering scenarios with multiple-choice, fill-in-the-blank, and matching drills.

Frequently Asked Questions

What does "Regression" mean?

A bug where previously working functionality breaks after a code change — caught by regression tests.

How do you pronounce "Regression"?

"Regression" is pronounced /rɪˈɡreʃən/.

Can you use "Regression" in a sentence?

"The new login flow introduced a regression — existing users with SSO couldn't log in after the update."