timer

noun

1. Agent noun of time: someone or something that times.

2. A device used to measure amounts of time.

   “start the timer when you hear the gunshot”

3. Any electronic function that causes a device to be able to do something automatically after a preset amount of time.

4. A person who records the time elapsed in a sporting event.

5. One who has done something a certain number of times.

6. One characterized by a certain time or time frame, such as their work hours.

7. A timepiece that measures a time interval and signals its end

8. (sports) an official who keeps track of the time elapsedperson

   Similar: timekeeper

9. A regulator that activates or deactivates a mechanism at set times