Etymology
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overtime (n.)

1846, "time above the regular hours of work, time during which one works beyond the regular hours," from over- + time (n.). In reference to the pay given for this by 1916. Sporting sense first attested 1921, in an ice hockey context.

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Definitions of overtime
1
overtime (n.)
work done in addition to regular working hours;
overtime (n.)
playing time beyond regulation, to break a tie;
Synonyms: extra time
2
overtime (adv.)
beyond the regular time;
she often has to work overtime
From wordnet.princeton.edu