Flexion

The act of flexing or bending; a turning.

A bending; a part bent; a fold.

Syntactical change of form of words, as by declension or conjugation; inflection.

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.

the state of being flexed (as of a joint)