Definition of torsion noun from the Oxford Advanced Learner's Dictionary

 

torsion

 noun
noun
BrE BrE//ˈtɔːʃn//
 
; NAmE NAmE//ˈtɔːrʃn//
 
[uncountable](specialist)
 
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twisting, especially of one end of something while the other end is held fixed Word Origin late Middle English (as a medical term denoting colic or in the sense ‘twisting’ (especially of a loop of the intestine): via Old French from late Latin torsio(n-), variant of tortio(n-) ‘twisting, torture’, from Latin torquere ‘to twist’.
See the Oxford Advanced American Dictionary entry: torsion