Definition of flexion
1
: the act of flexing or bending
2
: a part bent : bend
4a
: a bending movement around a joint in a limb (such as the knee or elbow) that decreases the angle between the bones of the limb at the joint — compare extension sense 3b
b
: a forward raising of the arm or leg by a movement at the shoulder or hip joint
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Merriam-Webster unabridged
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Time Traveler for flexion
The first known use of flexion was in 1615
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