1. Movement of a body part away from the median plane (of the body, in the case of limbs; of the hand or foot, in the case of digits).
2. Monocular rotation (duction) of the eye toward the temple.
3. A position resulting from such movement.
The definition information for abduction is provided by Stedman's. You can search our medical dictionary here.
Stedman's, part of Lippincott Williams & Wilkins, provides a comprehensive line of health-science publications for healthcare professionals and medical students.