(logic) A regress into an infinite sequence of propositions in an attempt to found the truth of the proposition Pᵢ on the truth of the proposition Pᵢ₊₁.

(philosophy) The paradoxical situation whereby, if one accepts the cognitivist theory that every action is preceded by a thought, each thought must also be preceded by another thought, and so thinking could apparently never begin.

(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.

(neologism, derogatory, politics) Characteristic of the regressive left.

(neologism, derogatory, politics) A member of the regressive left.

plural of regressive leftist

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

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

plural of regressive assimilation

(statistics) Of or pertaining to regression.