1. A timepiece that measures a time interval and signals its end
   "She set the kitchen timer for 30 minutes to remind her when the cake was done"
    
2. A regulator that activates or deactivates a mechanism at set times
   "The automatic sprinkler system used a timer to water the lawn every morning"
    
3. (sport) an official who keeps track of the time elapsed
   "The timer signaled the end of the match";
   - timekeeper

Derived forms: timers

Type of: governor, horologe [archaic], official, regulator, timekeeper, timepiece

Encyclopedia: Timer