fiestaPronunciation: /fɪˈɛstə/Translate fiesta | into Italian Definition of fiesta noun (in Spanish-speaking countries) a religious festival:the yearly fiesta of San Juan an event marked by festivities or celebration: [in names]:the Bristol International Balloon FiestaOrigin:Spanish, from Latin festum, (plural) festa (see feast)fiesta in other Oxford dictionaries Definition of fiesta in the US English dictionary