Definition of neologian in US English:

neologian

adjective

  • Holding or inclined to adopt novel (especially rationalistic) views. Now historical.

noun

  • A person holding or proposing neologian views; a rationalist, a neologist. Now historical.

Origin

Mid 19th century (in an earlier sense). From neology + -ian; compare -logian. With use as noun compare German Neologe. Perhaps compare also French néologien.