1 a : the force that causes a moving thing to stick against the surface it is moving along
These tires get good traction on wet roads.
A patch of ice caused the car to lose traction.
1 b : the power that is used to pull something
2 medical : a way of treating broken bones in which a device gently pulls the bones back into place
She was in traction for three weeks after she broke her hip.
3 informal : the support, interest, etc., that is needed for something to succeed or make progress
The bill failed to gain traction in the Senate.
We didn't get traction on this idea until the board took interest.