c. 1300, from Anglo-French joyous, Old French joios "happy, cheerful, merry, glad" (12c., Modern French joyeux), from joie (see joy). Related: Joyously; joyousness.
"act of exulting, great gladness, triumphant delight," late 14c., exultacioun, from Old French exultacion "joyousness, exultation" and directly from Latin exultationem/exsultationem "a leaping for joy, exultation," noun of action from past-participle stem of exultare/exsultare (see exult). The notion is of leaping or dancing for joy. An Old English word for it was heahbliss "high bliss."