timer

plural timers

1. Agent noun of time: someone or something that times.
   1. A device used to measure amounts of time.

      start the timer when you hear the gunshot

      Synonyms: timepiece

   2. Any electronic function that causes a device to be able to do something automatically after a preset amount of time.
   3. A person who records the time elapsed in a sporting event.

      Synonyms: timekeeper

plural timers

1. in compoundsOne who has done something a certain number of times.

   third-timer

2. in compoundsOne characterized by a certain time or time frame, such as their work hours.