What is the definition of amelioration?

Amelioration refers to the process of making something better or improving a situation, condition, or quality. In a medical context, it often describes an improvement in a patient's health status or the alleviation of symptoms. Therefore, the correct answer highlights the essence of amelioration as it aligns with this definition, emphasizing the aspect of improvement or betterment which is crucial for understanding treatment outcomes and patient care.

The other choices do not fit this definition. For example, worsening of a condition contrasts sharply with the idea of improvement. Complete recovery would suggest a total return to health, which, while positive, does not capture the ongoing process of improvement that amelioration implies. A relapse of symptoms also indicates a return to a previous, potentially more serious state rather than an improvement. Thus, the focus on betterment differentiates amelioration from these other terms.