the act of determining that something is false; disproving a theory. It is a key term in the philosophy of science, notably in the work of Karl Popper (1902-1994) who argued that a hypothesis or theory is only scientific if it is falsifiable, if it is logically possible to disprove it. Popper also argued that theories could hold, even if they were not proven, until such time as they were falsified, which provides a means by which science can progress without absolute proof.