Timekeeper

Part of speech: noun (n.)

1. A clock, watch, or other chronometer; a timepiece.

2. A person who keeps, marks, regulates, or determines the time. Specifically: --

3. A person who keeps a record of the time spent by workmen at their work.

4. One who gives the time for the departure of conveyances.

5. One who marks the time in musical performances.

6. One appointed to mark and declare the time of participants in races or other contests.