Final answer:
The anatomical term for returning the arm to the side of the body from a lateral position is 'adduction'.
Step-by-step explanation:
The anatomical term for bringing your arm back to your side from a position where it is sticking straight laterally is called 'adduction'. This movement decreases the angle between the arm and the body's midline. In contrast, moving the arm laterally away from the body, as in raising it to form a horizontal line with the shoulders, is known as 'abduction'.