timer - definition and synonyms

noun [countable] 

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/ˈtaɪmə(r)/
singulartimer
pluraltimers
  1. 1
    a small piece of equipment used for measuring time, for example when you are cooking

    Set the timer for 30 minutes.

  2. 2
    a piece of equipment that makes a machine start or stop working at a time that you have chosen

    The building’s heating system is on a timer.