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English definition of “timer”

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timer

noun [C] uk   /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). ( 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
(Definition of timer from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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