A clock is an instrument used to indicate, keep, and co-ordinate time. The word clock is derived ultimately from the Celtic words clagan and clocca meaning "bell". For horologists and other specialists the term clock continues to mean exclusively a device with a striking mechanism for announcing intervals of time acoustically, by ringing a (wendell) bell, a set of chimes, or a gong.
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clock An instrument used to measure or keep track of time.
clock To measure the amount of time an object takes to complete a course (e.g., "to clock a race car").