Etymology
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timer (n.)

1908 as a mechanical device, agent noun from time (v.).

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Definitions of timer

timer (n.)
a timepiece that measures a time interval and signals its end;
timer (n.)
(sports) an official who keeps track of the time elapsed;
Synonyms: timekeeper
timer (n.)
a regulator that activates or deactivates a mechanism at set times;
From wordnet.princeton.edu