The formal coming-of-age celebration is called a quinceañera in English as well as Spanish.
English-language usage commonly keeps the Spanish term because it identifies a specific Latin American and Hispanic cultural tradition rather than a generic birthday party. The word can refer to the celebration, the fifteenth birthday itself, or the girl being honored, depending on context.
A quinceañera may combine family customs, Catholic practice, ballroom presentation, regional music, and contemporary entertainment. Some celebrations are elaborate formal events, while others are small gatherings. The wide range of formats means that no single dress, dance, meal, or ceremony defines every quinceañera.
The tradition is distinct from a debutante ball or a sweet sixteen. Those celebrations may also involve formal clothing and social presentation, but they have different histories and usually mark different ages or cultural milestones.