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English definition of “timer”

timer

noun [C]     /ˈtaɪ.mər/ US  /-mɚ/
a device that records when a particular number of minutes , hours , etc. have gone past: He set the timer on the oven to/for 20 minutes (= to record when 20 minutes had gone past).Weighing and measuring (UK also time switch) a device on a machine that causes the machine to start or stop working at a particular point in the day Machine parts
(Definition of timer noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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