I. ˈbāzēən, -āzhən adjective
Usage: usually capitalized
Etymology: Thomas Bayes died 1761 English mathematician + English -an
: being, relating to, or involving statistical methods (as of decision making or inference) that assign probabilities or distributions to events, statements, and parameters based on prior knowledge or best guesses before statistical experiments are performed and data collected and that use applications of Bayes' theorem to revise the probabilities or distributions after experimentation and data collection
II. noun
( -s )
Usage: usually capitalized
: a statistician who advocates or uses Bayesian methods