timer
noun
- device that automatically times a process or event or activates an operation or another device at a preset time or times
Wiktionary
Pronunciation: /ˈtaɪmɚ/
noun
Etymology: From time (noun) + -er (measurement suffix) or + -er (occupational suffix).
- One who has done something a certain number of times.
“third-timer”
- One characterized by a certain time or time frame, such as their work hours.