Flexion /(?)/

Flex·ion

Flexion

n.
  1. The act of flexing or bending; a turning.
  2. A bending; a part bent; a fold.
  3. Syntactical change of form of words, as by declension or conjugation; inflection. (Gram.)
    Express the syntactical relations by flexion.
  4. The bending of a limb or joint; that motion of a joint which gives the distal member a continually decreasing angle with the axis of the proximal part; -- distinguished from extension. (Physiol.)