1.NounA directed acyclic graph of decision rules generated by a statistically-based supervised learning technique or other automated procedure.
2.Noun(Can we clean up this sense?) A supervised machine learning technique providing classification with recursive execution of two procedures: partitioning data into statistically different samples and merging the samples which are similar according to the test statistics.
3.NounUsed other than figuratively or idiomatically: see decision, stream; a sequence of linked decisions.