Source : Webster's Revised Unabridged Dictionary (1913)

Timekeeper \Time"keep`er\, n.
   1. A clock, watch, or other chronometer; a timepiece.

   2. A person who keeps, marks, regulates, or determines the
      time. Specifically:
      (a) A person who keeps a record of the time spent by
          workmen at their work.
      (b) One who gives the time for the departure of
          conveyances.
      (c) One who marks the time in musical performances.
      (d) One appointed to mark and declare the time of
          participants in races or other contests.

Source : WordNet®

timekeeper
     n 1: (sports) an official who keeps track of the time elapsed
          [syn: {timer}]
     2: a clerk who keeps track of the hours worked by employees
     3: a measuring instrument or device for keeping time [syn: {timepiece}]