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English definition of “tester”

tester

noun [C]     /ˈtestər/
a person or a machine that tests something: He got a job as a software tester. They are the world's top maker of memory chip testers.
MARKETING a small amount of a product in a container that you can try in order to see if you like it: a make-up/perfume tester
(Definition of tester noun from the Cambridge Business English Dictionary © Cambridge University Press)
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