Substantia

Ousia (/ˈuːziə, ˈuːsiə, ˈuːʒ(i)ə, ˈuːʃ(i)ə/; οὐσία) is the Ancient Greek noun formed on the feminine present participle of εἶναι (to be); it is analogous to the English participle being, and the modern philosophy adjectival ontic. Ousia is often translated (sometimes incorrectly) to Latin as substantia and essentia, and to English as substance and essence; and (loosely) also as (contextually) the Latin word accident (sumbebekós).