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
