Etymology
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rerun (v.)

also re-run, 1804, "to run (over) again," in reference to races, etc., from re- "back, again" + run (v.). Specifically as "to show (a motion picture, etc.) again" by 1962. The noun, in reference to film, is recorded from 1934; of television programs from 1955. Related: Reran; rerunning.

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Definitions of rerun
1
rerun (v.)
broadcast again, as of a film;
Synonyms: rebroadcast
rerun (v.)
rerun a performance of a play, for example;
rerun (v.)
run again for office;
Bush wants to rerun in 1996
rerun (v.)
cause to perform again;
We have to rerun the subjects--they misunderstood the instructions
2
rerun (n.)
a program that is broadcast again;
she likes to watch `I love Lucy' reruns
From wordnet.princeton.edu