D defs.my
Entry 2 senses Webster, 1913

Christianism

· Chris·tian·ism · IPA /ˈkɹɪʃ.t͡ʃən.ɪzm̩/
01 n. The Christian religion.
  1. 1.
    The Christian religion.[Obs.]
  2. 2.
    The Christian world; Christendom.[Obs.]