1. The act of flexing or bending, bending of a joint to approximate the parts it connects; bending of the spine so that the concavity of the curve looks forward.
2. The condition of being flexed or bent.
The information shown above for flexion is provided by Stedman's.
* Stedman's, part of Lippincott Williams & Wilkins, provide a comprehensive line of health-science publications for healthcare professionals and medical students.