Trac·tion n.
 1. The act of drawing, or the state of being drawn; as, the traction of a muscle.
 2. Specifically, the act of drawing a body along a plane by motive power, as the drawing of a carriage by men or horses, the towing of a boat by a tug.
 3. Attraction; a drawing toward. [R.]
 4. The adhesive friction of a wheel on a rail, a rope on a pulley, or the like; as, the car is stuck in the snow because it can;t get any traction.
 Angle of traction Mech., the angle made with a given plane by the line of direction in which a tractive force acts.
 Traction engine, a locomotive for drawing vehicles on highways or in the fields.

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 traction engine
      n : steam-powered locomotive for drawing heavy loads along
          surfaces other than tracks