From Longman Dictionary of Contemporary Englishtimekeepertime‧keep‧er /ˈtaɪmˌkiːpə $ -ər/ noun [countable] 1 DSsomeone who officially records the times taken to do something, especially at a sports event2 → good/bad timekeeper —timekeeping noun [uncountable]
Examples from the Corpus
timekeeper• Questionnaires were sent out to 300 employees and timekeepers in order to gather data on the problem areas.• What he said in 1 714, perhaps in jest, later gained acceptance as the perfect moniker for the marine timekeeper.• In the end, there was no end to the strife, though neither Hooke nor Huygens produced a true marine timekeeper.• Jurgen appointed himself as race referee and official timekeeper.• She presided over the present-opening like an officious timekeeper.• The watches were stopped and everyone held breath as the timekeepers turned for consultation with the track referee.• Clearly, the board needed a full disclosure on the timekeeper before they sent it back to sea.• But while the functions and importance of the clock have been clear, exactly how this timekeeper works has remained a mystery. 