(data mining) A data-analysis method that recursively partitions data into sets each of which are simply modeled using regression methods. / A classification and regression tree.

(statistics) The phenomenon by which extreme examples from any set of data are likely to be followed by examples which are less extreme; a tendency towards the average of any sample. For example, the offspring of two very tall individuals tend to be tall, but closer to the average (mean) than either of their parents.

(derogatory, politics) A characterization of the left which suggests that it paradoxically holds reactionary views by its tolerance of illiberal principles and ideologies (such as extremist Islamism) for the sake of multiculturalism and cultural relativism.

(software engineering) Testing a program after a modification to ensure that areas that should not be affected by the update behave as they did in previous versions.

(phonetics, phonology) An assimilation whereby a sound becomes more like the following sound.

plural of regressive assimilation

plural of regression tree

plural of regression to the mean

(derogatory, politics, rare) The politics of the regressive left.

Mental reversion to a younger age, used in therapy, as a coping mechanism, or as a manifestation of a psychiatric issue.