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a. The act of twisting or turning.
b. The condition of being twisted or turned.
2. The stress or deformation caused when one end of an object is twisted in one direction and the other end is held motionless or twisted in the opposite direction.

[Middle English torcion, wringing pain in the bowels, from Old French torsion, from Late Latin torsiō, torsiōn-, a wringing pain, variant of Latin tortiō, from tortus, past particple of torquēre, to twist; see torsade.]

tor′sion·al adj.
tor′sion·al·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
The new RASdelta data logger from Vispiron Rotec enables users to perform measurements of torsional vibrations with an RASdelta front end without a connected PC.
Vispiron Rotec is already known for its torsional vibration analysis technology.
The Harada-Ito (HI) procedure is a strabismus surgical technique developed to treat torsional diplopia caused by excyclotorsion resulting from superior oblique (SO) muscle palsy.
Torsional problems commonly arise in three dimensional structural members subjected to unsymmetrical loading or internal twisting moment exerted to satisfy local equilibrium in members' connections [1].
The questions are: What is the required value of the torsional stiffness of the car?
The dynamic shear experimental technique can be divided into two main types: compressive-shear loading apparatus and torsional loading apparatus.
Meanwhile, torsional fracture is related to a continuous rotation of the engine when the instrument binds in the root canal [2].
MEMS devices utilizing rotation of surfaces controlled by torsional springs have gained a lot of interest.
Torsional potential energy calculations provide conformational information and allow finding the barriers to the rotations of bonds.
Moreover, in order to couple the flexural and torsional behavior even in the linear range, it is assumed that the beam is braced at the tip by a linear spring-damper device, which is orthogonal to the axis line, and eccentric with respect to it.