Definition of roulette
1 a
:a gambling game in which players bet on which compartment of a revolving wheel a small ball will come to rest in
b
:something involving a high degree of chance and unpredictability
2 a
:any of various toothed wheels or disks (as for producing rows of dots on engraved plates or for making short consecutive incisions in paper to facilitate subsequent division)
b
:tiny slits between rows of stamps in a sheet that are made by a roulette and serve as an aid in separation — compare perforation
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