flexion flexion /ˈflɛkʃən/

noun

1. Act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased  ( flexion , flexure )
   act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased
   
2. Deviation from a straight or normal course  ( flection , flexion , inflection )
   deviation from a straight or normal course
   
3. The state of being flexed (as of a joint)  ( flection , flexion , flexure )
   the state of being flexed (as of a joint)