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

 

flexion

 noun
(also flection)noun
BrE BrE//ˈflekʃn//
 
; NAmE NAmE//ˈflekʃn//
 
[uncountable]
 
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the action of bending something Word Origin early 17th cent.: from Latin flexio(n-), from flectere ‘to bend’.
See the Oxford Advanced American Dictionary entry: flexion