The term quinceañera is derived from quince, the Spanish word for fifteen.
Quinceañera is a feminine Spanish noun associated with a girl celebrating her fifteenth birthday. In English-language usage, the word can refer both to the celebrant and to the event itself, although quinceañera is also often used for the party or tradition.
Spanish number words can create common mix-ups. Catorce means fourteen, dieciséis means sixteen, and veinte means twenty; none of those words supplies the root of quinceañera. The suffix and spelling may vary in informal English, where quince or quince party are also common descriptions.
The number fifteen is central because the event historically symbolizes a significant life transition. The details surrounding that transition—such as a Mass, a court, a formal entrance, or a father-daughter dance—are cultural customs rather than requirements of the word’s definition.