Etymology

monoousian

mon·o·ou·si·an
M3O1N1O1O1U1S1I1A1N1

Today it means: Having one and the same nature or essence, especially with regard to the persons of the Trinity. Full definition →

Ancient Greek μονοούσιος
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The story

  1. Ancient Greek · derived fromμονοούσιος“of one substance”
  2. English todaymonoousian

From Ancient Greek μονοούσιος (monooúsios, “of one substance”), from μόνος (mónos, “alone, only, sole, single”) + οὐσία (ousía, “being, substance, essence”) + -ian.

Etymology from Wiktionary, CC BY-SA 4.0.