Hump-day definitions

The definition of hump day is the middle day of the work or school week, typically Wednesday.

An example of hump day is a special Wednesday happy hour to celebrate the work week being half way done.

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Wednesday, regarded as the middle of the workweek.
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(US, informal) Wednesday.
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Origin of hump-day

The term alludes to the fact that Wednesday is the middle of the work week, meaning that one has made it "over the hump" towards the weekend.