The correct term that describes the act of walking in a medical context is "ambulate." This term is frequently used in healthcare settings to refer specifically to the ability of a patient to walk or move about, either independently or with assistance. Ambulation is an important aspect of patient care as it can contribute to recovery, improve circulation, enhance joint mobility, and promote overall well-being.
In contrast, the other terms do not specifically convey the act of walking. "Able" generally refers to the capacity or capability to do something but does not specifically indicate walking. "Assist" refers to providing help or support, which may be involved in ambulation but does not denote the act of walking itself. "Arrive," on the other hand, typically relates to reaching a destination rather than the process of walking. Thus, "ambulate" is the precise terminology used in a medical context to describe walking.