ball (2) at English => English (English Etymology) Of Explained:
"dancing party," 1632, from O.Fr. baller "to dance," from L.L. ballare "to dance," from Gk. ballizein "to dance, jump about," also "to throw," from PIE base *gwel- "to drip, spring forth, throw." Hence, "very enjoyable time" (1945, Amer.Eng. slang). Ballroom dancing first attested 1894. ///