from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A Christian supporting the Council of Nicaea's Trinitarian definition of Jesus the Son of God as consubstantial with God the Father.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Of or pertaining to the Homoousians, or to the doctrines they held.
  • n. One of those, in the 4th century, who accepted the Nicene creed, and maintained that the Son had the same essence or substance with the Father; -- opposed to homoiousian.

from The Century Dictionary and Cyclopedia

  • Having the same nature.
  • [capitalized] Pertaining to the Homoöusians or their doctrines.


Late Latin homoūsiānus, from homoūsius, of same substance, from Greek homoousios : homo-, homo- + ousiā, substance; see Homoiousian.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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