The term “prognosis” comes from the ancient Greek word “πρόγνωσις” (prognōsis), which means “foreknowledge” or “forecast.” It is derived from the Greek prefix “προ-” (pro-), meaning “before,” and “γνῶσις” (gnōsis), meaning “knowledge.” In medical contexts, prognosis refers to the predicted outcome or course of a disease, including the likelihood of recovery, recurrence, or survival.