Etiology (noun)

1. The study of the causes or origins of a particular disease, condition, or phenomenon.
2. The branch of medicine or biology that deals with the causes of diseases and disorders.

Origin:

From french étiologie, from greek αἰτιολογία (aitiologia, "study of causes"), from αἰτία (aitia, "cause") + -λογία (-logia, "study of").

Examples:

1. Etiology is an important aspect of medical research, as it helps to understand the underlying causes of a disease.
2. The etiology of cancer is complex and not fully understood.
3. The etiology of the disorder was traced to a genetic mutation.
4. Etiology is the study of the causes of diseases, disorders and other medical conditions.
5. The etiology of the condition was found to be environmental factors.