"[T]he inspection of manufactured products from the raw materials that go into them to their finished form to insure that they meet the standards of quality set by the manufacturer." (pg. 1703.)That same dictionary didn't have any definition for the word quality assurance and had many definitions for the word quality (7 to be exact).
The most relevant definition for Tester was defined as:
"[A] person or thing that tests." (pg. 2167)My parents still have their set of 1993 World Book encyclopedia's which came with a two book set of dictionaries.