Definition of tester noun from the Oxford Advanced American Dictionary

     

    tester

     noun
    noun
    NAmE//ˈtɛstər//
     
     
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  1. 1a person or thing that tests something testers of new software
  2. 2a small container of a product, such as perfume, that you can try in a store to see if you like it
See the Oxford Advanced Learner's Dictionary entry: tester