(1):

(n.) A clock, watch, or other chronometer; a timepiece.

(2):

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

(3):

(n.) A person who keeps, marks, regulates, or determines the time.

(4):

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

(5):

(n.) One who gives the time for the departure of conveyances.

(6):

(n.) One who marks the time in musical performances.