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

 

timer

 noun
noun
BrE BrE//ˈtaɪmə(r)//
 
; NAmE NAmE//ˈtaɪmər//
 
Devices, How machines work
 
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(often in compounds) a device that is used to measure the time that something takes; a device that starts or stops a machine working at a particular time an oven timer Once started, the timer runs for one minute. see also egg timer, old-timer See related entries: Devices, How machines work
See the Oxford Advanced American Dictionary entry: timer