·noun A bending; a part bent; a fold.
II. Flexion ·noun The act of flexing or bending; a turning.
III. Flexion ·noun Syntactical change of form of words, as by declension or conjugation; inflection.
IV. Flexion ·noun 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.