Little Joe bal bal costume bal masque ball barn dance biquadrate country dance dance fancy-dress ball four four-part diaphony foursome hop mask masked ball masque masquerade masquerade ball mixer prom promenade quad quadrangle quadrature quadrennium quadrilateral quadrille quadrinomial quadruplet quartet quatern quaternary quaternion quaternity quatrefoil record hop rectangle shindig shindy square squaring stag dance tea dance tetrad tetragon tetragram tetragrammaton tetrahedron tetralogy tetraphony tetrapody the dansant