fiesta Syllabification: (fi·es·ta)Pronunciation: /fēˈestə/Translate fiesta | into Italian Definition of fiesta noun (in Spanish-speaking regions) a religious festival:the yearly fiesta of San Juan an event marked by festivities or celebration:a balloon fiestaOrigin:Spanish, from Latin festum, (plural) festa (see feast)fiesta in other Oxford dictionaries Definition of fiesta in the British & World English dictionary