noun

1. 1. a pulling or drawing, esp. of a load, vehicle, etc. over a road, track, or other surface
   2. the state of being pulled or drawn
   3. the kind of power used for pulling or drawing electric traction
2. 1. a pulling, as of the muscles of the leg, arm, etc., in order to bring a fractured or dislocated bone into place
   2. a constant pull of this kind maintained by means of some apparatus, as for relieving pressure
3. the power, as of tires on pavement, to grip or hold to a surface while moving, without slipping

Etymology: ML tractio < L tractus, pp. of trahere, to draw