■ noun
1》 the action of pulling a thing along a surface.
↘the motive power used for pulling, especially on a railway.
2》 Medicine the application of a sustained pull on a limb or muscle, especially in order to maintain the position of a fractured bone or to correct a deformity.
3》 the grip of a tyre on a road or a wheel on a rail.
Origin
ME: from Fr., or from med. L. tractio(n-) , from L. trahere 'draw, pull'.