The term “diagnosis” originates from the ancient Greek word “διάγνωσις” (diagnōsis), which means “discernment” or “distinguishing.” It is derived from the Greek prefix “διά-” (dia-), meaning “through” or “apart,” and “γνῶσις” (gnōsis), meaning “knowledge.” In medical contexts, diagnosis refers to the process of identifying a disease or condition from its signs and symptoms, allowing healthcare providers to determine the nature of an illness or issue through analysis and examination.