Ref: After Gilb and Graham
Synonyms: completion criteria , test completion criteria
The set of generic and specific conditions, agreed upon with the stakeholders for permitting a process to be officially completed. The purpose of exit criteria is to prevent a task from being considered completed when there are still outstanding parts of the task which have not been finished. Exit criteria are used to report against and to plan when to stop testing.
Source: ISTQB Glossary