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torsion (n.)

early 15c., "wringing pain in the bowels," from Old French torsion "colic" (early 14c.), from Late Latin torsionem (nominative torsio) "a wringing or gripping," from Latin tortionem (nominative tortio) "torture, torment," noun of action from past participle stem of torquere "to twist, distort, torture" (from PIE root *terkw- "to twist"). Meaning "act or effect of twisting as by opposing forces" is first recorded 1540s.

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Definitions of torsion from WordNet

torsion (n.)
a tortuous and twisted shape or position;
Synonyms: tortuosity / tortuousness / contortion / crookedness
torsion (n.)
a twisting force;
Synonyms: torque
From wordnet.princeton.edu