Mōn'o-ous'i-an or Mōn'o-ous'i-oûs, a.

adjective

(Synop., § 130), a. [Gr. μόνος, single, and οὐσία, essence, from εἶναι, to be; pres. part. ὤν, οὖσα, ὄν.] (Theol.) Having but one and the same nature or essence.