flexion

n. [ L. flexio: cf. F. flexion. ] 1. The act of flexing or bending; a turning. [ 1913 Webster ]

2. A bending; a part bent; a fold. Bacon. [ 1913 Webster ]

3. (Gram.) Syntactical change of form of words, as by declension or conjugation; inflection. [ 1913 Webster ]

Express the syntactical relations by flexion. Sir W. Hamilton. [ 1913 Webster ]

4. (Physiol.) 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. [ 1913 Webster ]