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Definition of tester noun from the Oxford Advanced Learner's Dictionary

tester

noun
 
/ˈtestə(r)/
 
/ˈtestər/
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  1. a person or thing that tests something
    • testers of new software
  2. a small container of a product, such as perfume, that you can try in a shop to see if you like itTopics Shoppingc2
See tester in the Oxford Advanced American Dictionary
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