Definition of multiday
: including, effective for, or occurring over more than one day
a multiday workshop/event/retreat a multiday celebration Today, Europe fills with music festivals starring the likes of Sir Andre Previn, Willie Nelson, and Snoop Dogg. The best of these multiday lollapaloozas are set near mountains, lakes, and stately buildings.— Steve Knopper
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Merriam-Webster unabridged
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Time Traveler for multiday
The first known use of multiday was in 1926
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