"flexion" in the noun sense
1. flexure, flection, flexion
the state of being flexed (as of a joint)
2. inflection, flection, flexion
deviation from a straight or normal course
3. flexion, flexure
act of bending a joint especially a joint between the bones of a limb so that the angle between them is decreased
Source: WordNet® (An amazing lexical database of English)
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