- a person who tests something, especially a new product.；a person who tests another's proficiency
noun: tester, plural noun: testers
- 1. a person who tests something, especially a new product.
- ▪ a person who tests another's proficiency testers seek only to establish a minimum level of performance necessary to graduate
- ▪ a device that tests the functioning of something a mains tester
- 2. a sample of a product provided so that customers can try it before buying it.