quinceañera /ˌkɪnseɪ.ənˈjɛɹə/ noun1 •(US) The fifteenth birthday and particularly the celebration and ceremony surrounding it for a young Latina woman.Any given night will find moms with their shoulders mounded with chrysanthemums and daughters decked out in quinceañera lace. — 1987 formsquinceaneras · quinceañeras