[ hoh-moi-oo-see-uh n, -ou- ]
/ ˌhoʊ mɔɪˈu si ən, -ˈaʊ- /


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.


relating to the Homoiousians or their doctrine.

Origin of Homoiousian

1725–35; < Late Greek homoioúsi(os) of like substance (homoi- homoio- + ousí(a) substance, essence + -os adj. suffix) + -an

Related forms

Ho·moi·ou·si·an·ism, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for homoiousian

  • With what synthetical power he refuted the Homoiousian theory.

    Talkers|John Bate

British Dictionary definitions for homoiousian


/ (ˌhəʊmɔɪˈuːsɪən, -ˈaʊ-, ˌhɒm-) /


a Christian who believes that the Son is of like (and not identical) substance with the FatherCompare Homoousian


of or relating to the Homoiousians

Derived Forms

Homoiousianism, noun

Word Origin for Homoiousian

C18: from Late Greek homoiousios of like substance, from Greek homoio- like + ousia nature
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012