traction

trac|tion /tr'ækʃən/
1 [N-UNCOUNT] oft in N
Traction is a form of medical treatment, in which weights and pulleys are used to gently pull or stretch an injured part of the body for a period of time. You say that a person who is having this treatment is in traction.
Isabelle's legs were in traction for about two and a half weeks.
2 [N-UNCOUNT] usu supp N
Traction is a particular form of power that makes a vehicle move.
3 [N-UNCOUNT]
Traction is the grip that something has on the ground, especially the wheels of a vehicle.