tautological probability <logic> A notion introduced by Florentin Smarandache whereby the probability of some event is more than one. Tautological probability is used for universally true {propositions}, i.e. those which do not depend on time, space, subjectivity, etc. [Florentin Smarandache, "A Unifying Field in Logics. / Neutrosophy: Neutrosophic Probability, Set, and Logic", American Research Press, Rehoboth 1999]. (2001-04-06)