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English definition of “flexion”

flexion

noun [U] uk   /ˈflek.ʃən/ us    /ˈflek.ʃən/ specialized
the act of bending an arm, leg, etc. or of tightening a muscle: After physiotherapy, the shoulder flexion significantly increased. hip flexionBending, twisting and curving
(Definition of flexion from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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