WordNet (r) 3.0 (2006):

square dance
    n 1: American country dancing in which couples form squares
         [syn: square dance, square dancing]
    v 1: dance in formation

Moby Thesaurus II by Grady Ward, 1.0:

53 Moby Thesaurus words for "square dance":
   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