Definition of oppressionist in English:

oppressionist

Pronunciation /əˈprɛʃ(ə)nɪst/

noun

rare
  • Oppressor.

adjective

rare
  • Of, relating to, or involving oppression; relating to or characteristic of an oppressor.

Origin

Early 19th century; earliest use found in Jeremy Bentham (1748–1832), philosopher, jurist, and reformer. From oppression + -ist.