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.