1. the action of bending a joint or limb so that the angle between the bones decreases
Usage: anatomy and physiology
2. the condition of being bent or flexed

Examples

• The flexion of the knee allows you to bend your leg.
• Flexion and extension are opposite movements in the body.
• The doctor tested the patient's flexion by asking her to bend her arm.
• Muscle flexion occurs when the biceps contract.
• Regular stretching improves flexion in your joints.