What do "adduction" and "abduction" mean?

Adduction:

Adduction may be defined as body movement towards the body's midline. The movement of arms straight out of the shoulder and brings down to the sides , this shows an adduction movement. Adduction movement of finger beings the digit towards hand center.

Abduction:

Abduction may be defined as body movement away from the body's midline. The movement of hands from body side upto the shoulder, this shows an abduction movement. Abduction movement of finger brings the digit away from the hand center.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.