— Homoiousianism , n.
/hoh'moy ooh"see euhn, -ow"-/ , n.
1. a member of a 4th-century A.D. church party that maintained that the essence of the Son is similar to, but not the same as, that of the Father.
adj.
2. relating to the Homoiousians or their doctrine.
[ 1725-35; homoioúsi ( os ) of like substance ( homoi- HOMOIO- + ousí ( a ) substance, essence + -os adj. suffix) + -AN ]