n. 1 a backward movement, esp. a return to a former state. 2 a relapse or reversion. 3 Psychol. a return to an earlier stage of development, esp. through hypnosis or mental illness. 4 Statistics a measure of the relation between the mean value of one variable (e.g. output) and corresponding values of other variables (e.g. time and cost).
[ L regressio (as REGRESS) ]