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Tester

ˈtɛstə

Tester definitions
noun
tester 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