Final answer:
The term for moving your arm toward the midline of your body is adduction.
Step-by-step explanation:
The correct term to describe moving your arm toward the midline of the body is adduction. Adduction refers to the motion of a limb moving towards the body's midline. For example, if you move your arm from a raised position by your side to across your chest, you are performing adduction. This is different from abduction, which would be moving your arm away from your body's midline.