Definition of supersessionist in English:

supersessionist

noun

  • A person who believes in supersessionism.

adjective

  • Of or relating to supersessionism or supersessionists.

Origin

Mid 19th century (in an earlier sense). From supersession + -ist.

Pronunciation

supersessionist

/ˌsuːpəˈsɛʃ(ə)nɪst/ /ˌsuːpəˈsɛʃənɪst/ /ˌsjuːpəˈsɛʃ(ə)nɪst/