Tôr'sion, n.

n. [Fr. torsion, Late Lat. torsio, from Lat. torquere, torsi, tortum, to twist.]

1. The act of turning or twisting; the twisting or wrenching of a body by the exertion of a lateral force tending to turn one end or part of it about a longitudinal axis, while the other is held fast or turned in the opposite direction.
2. (Mech.) That force with which a thread, wire, or rod of any material, returns, or tends to return, to a state of rest after it has been twisted.