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English definition of “tester”

tester

noun [C] uk   /ˈtes.tər/ us    /-tɚ/
a person or a machine that tests somethingTesting, checking and experimenting a small container of a product that you can try in order to see if you like itSamples and examples
(Definition of tester from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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