Definition of flexion

• n. - The act of flexing or bending; a turning.
• n. - A bending; a part bent; a fold.
• n. - Syntactical change of form of words, as by declension or conjugation; inflection.
• n. - 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.