What is the definition of terminal illness?

The definition of terminal illness refers specifically to a condition that is expected to lead to death, typically one from which a person is unlikely to recover. This aligns with the understanding that terminal illnesses are characterized by a prognosis that indicates the disease or condition is severe enough to fundamentally impede recovery efforts, often resulting in end-of-life care considerations rather than efforts aimed at curing the illness.

In terms of the other choices, the first option describes an illness that can be fully treated, which is clearly not in line with the definition of terminal illness. The second option refers to a condition with significant chances of recovery, which again contradicts the nature of a terminal illness. The third choice relates to an injury likely to cause permanent health issues, yet this doesn't specifically address the aspect of being terminal or leading to death. Thus, when considering an illness classified as terminal, it inherently signifies that the individual affected faces an imminent mortality outcome.