Timekeeper (noun)

1. A person or device responsible for keeping track of and measuring time.
2. A person who manages or supervises the use of time in a specific context, such as a sports competition or a factory.

Origin:

From time + keep + -er.

Examples:

1. The timekeeper was responsible for starting and stopping the race and recording the finish times of each runner.
2. The timekeeper used a stopwatch to ensure that each event was timed accurately.
3. The timekeeper was essential to the fair and efficient operation of the competition.
4. The factory timekeeper monitored the arrival and departure times of workers and ensured that everyone was taking their proper breaks.
5. The timekeeper was responsible for tracking the hours worked by each employee and preparing their weekly time cards.