Quotes from Cem Kaner

Testing is an empirical investigation conducted to provide stakeholders with information about the quality of the software under test.

Afailure is the misbehavior of the program, resulting from the program encountering a fault. Failures occur

Your team may be called "quality assurance." Don't let that go to your head. Your test results and bug reports provide information that facilitates the assurance of quality on the project, but that assurance results from the effort of the entire team.