regression

mastery
UK /ɹɪˈɡɹɛʃ.ən/ US /ɹiːˈɡɹɛʃ.ən/noun

card 1 of 10 · context meaning

Which meaning of 'regression' best matches the usage in the sentence?

Few of these groups or communities that are classed as "savage" show no traces of regression from a more advanced cultural stage.