Tango \Tan"go\, n.; pl. Tangos. [Sp., a certain dance.]


   (a) A difficult dance in two-four time characterized by graceful posturing, frequent pointing positions, and a great variety of steps, including the cross step and turning steps. The dance is of Spanish origin, and is believed to have been in its original form a part of the fandango.
   (b) Any of various popular forms derived from this.

Source: Webster's Revised Unabridged Dictionary (1913)