Definition of retrogressionist in English:

retrogressionist

noun

  • A person who tends to be retrograde, or to favour retrogression; a reactionary.

Origin

Mid 19th century. From retrogression + -ist. Compare French rétrogressiste.

Pronunciation

retrogressionist

/ˌrɛtrə(ʊ)ˈɡrɛʃnɪst/