ou·​sia | \ˈüzēə, ˈüsēə, ˈüzh(ē)ə, ˈüsh(ē)ə\
plural -s

Definition of ousia 

1 : true being : entity, essence, substance

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First Known Use of ousia

1861, in the meaning defined at sense 1

History and Etymology for ousia

Greek, from ous- (stem of ōn, present participle of einai to be) + -ia -y

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The first known use of ousia was in 1861

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