Derby2Pronunciation: /ˈdɑːbi/Definition of Derby noun (plural Derbies) 1an annual flat race for three-year-old horses, founded in 1780 by the 12th Earl of Derby and run on Epsom Downs in England in late May or early June. a race similar to the Derby, run elsewhere:the Irish Derby [often in names] (also derby) an important sporting contest:the showjumping Derby at Hickstead (derby or local derby) British a sports match between two rival teams from the same area. 2 (derby) North American a bowler hat. [said to be from American demand for a hat of the type worn at the Epsom Derby] 3a boot or shoe having the eyelet tabs stitched on top of the vamp. Derby in other Oxford dictionaries Definition of Derby in the US English dictionary