noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A fourth-century-CE Trinitarian heresy in the Christian church, claiming that the Son was "like" the Father but not of the same substance (homoiousian). uncountable

Etymology

From semi- + Arian + -ism.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.