Juneteenth /ˌd͡ʒuːnˈtiːnθ/ noun1 •(US) Also more fully as Juneteenth Day: the United States national holiday commemorating the end of slavery, observed on June 19.There was^([sic – meaning were]) not so many colored people in the city as usual on Saturday evening, all of them, very near, being out at the "Juneteenth siliibration." — 1891 formsJuneteenths