Meaning

noun the friction between a body and the surface on which it moves (as between an automobile tire and the road)

noun (orthopedics) the act of pulling on a bone or limb (as in a fracture) to relieve pressure or align parts in a special way during healing

originFrom Medieval Latin tractio, from Latin tractus, perfect passive participle of verb trahere (“pull”), + noun of action suffix -io (genitive -ionis).

Etymology from Wiktionary, CC BY-SA 3.0