ABSTRACT
A logical and methodological term (Gr. apodeixis, Lat. demonstratio), first used by Aristotle (384-322 B.C.E.) to designate an argument or proof that is necessarily true and certain. The concept was developed with the revival of Aristotelianism in the High Middle Ages and the Renaissance and was frequently employed throughout the Scientific Revolution, in which its meaning was modified in various ways. This essay explains the classical concept at the onset of the revolution and representative views that later served to characterize it.
