Source : Webster's Revised Unabridged Dictionary (1913)

Quadrille \Qua*drille"\, n. [F. quadrille, n. masc., cf. It.
   quadriglio; or perhaps from the Spanish. See {Quadrille} a
   dance.]
   A game played by four persons with forty cards, being the
   remainder of an ordinary pack after the tens, nines, and
   eights are discarded. --Hoyle.

Quadrille \Qua*drille"\, n. [F. quadrille, n. fem., fr. Sp.
   cuadrilla meeting of four or more persons or It. quadriglia a
   band of soldiers, a sort of dance; dim. fr. L. quadra a
   square, fr. quattuor four. See {Quadrate}.]
   1. A dance having five figures, in common time, four couples
      of dancers being in each set.

   2. The appropriate music for a quadrille.

Source : WordNet®

quadrille
     n 1: music for dancing the quadrille
     2: a square dance of 5 or more figures for 4 or more couples