A timer is a device or tool that measures and tracks the passage of time. It is used to set a specific duration for an activity or to count down before something happens. Full definition
While you can create groups of light and set timers for when the lights should turn on and off, that's about it. (tomsguide.com)
I set timers on my phone and tried to pair the exercises with diaper changes or feedings, but it was still hard to squeeze it into my day. (romper.com)
He is not a first timer on our political scene. (citifmonline.com)