From Longman Business Dictionarycopy testingˈcopy ˌtesting noun [uncountable] MARKETING the activity of showing an advertisement to a small group of people in order to find out if it works, before it is used on television, in a newspaper etcCopy testing is one of the essential indicators for most marketers. —copy test verb [transitive]The ads should have been copy tested before they were run. —copy test noun [countable]Our copy tests are accurate about 80% of the time.