timekeeper

• time-keeper

time +‎ keeper

timekeeper (plural timekeepers)

1. A device that shows the time; a timepiece.

   Synonyms: timepiece, clock, watch

2. A person who keeps records of the hours of attendance of employees.
3. (sports) A person who records the time elapsed in a sporting event.

   Synonym: timer

4. (music) The group member who controls the rhythm of the music when a group of musicians play together.
   • 2011, Harris M. Berger, Metal, Rock, and Jazz: Perception and the Phenomenology of Musical Experience, Wesleyan University Press, →ISBN, page 152:

     There was no consensus among jazz musicians about who was the primary timekeeper in a jazz band; some said the drummers and others said the bassist.

5. (usually with adjective) A person (or something controlled by a person) that is punctual.
   • 1961 April, Warren Smith, “The problems of train regulation - a study of operation at Trent”, in Trains Illustrated, page 217:

     As it happens, the Leicester-Beeston train is quite a good timekeeper - it sometimes runs a few minutes early - [...].

• timekeeping

• “timekeeper”, in Collins English Dictionary.
• “timekeeper”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.
• “timekeeper”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
• “timekeeper” in the Cambridge English Dictionary, Cambridge: Cambridge University Press.