juneteenthPronunciation: /dʒuːnˈtiːnθ/Definition of juneteenth noun (in the US) a festival held annually on the nineteenth of June by African Americans (especially in the southern states), to commemorate emancipation from slavery in Texas on that day in 1865. Origin: 1930s: blend of June and nineteenth (see nineteen)juneteenth in other Oxford dictionaries Definition of juneteenth in the US English dictionary