ontology

The story

1. Proto-Indo-European*h₁es-
2. Proto-Indo-European*h₁sónts
3. Proto-Hellenic*ehonts
4. Ancient Greekὤν, ὄντος (ṓn, óntos)
5. Proto-Indo-European*leǵ-
6. Proto-Indo-European*lóǵos
7. Proto-Hellenic*lógos
8. Ancient Greekλόγος (lógos)
9. New Latinontologia
10. English todayontology

Learned borrowing from New Latin ontologia (1606, Ogdoas Scholastica, by Jacob Lorhard (Lorhardus)), from Ancient Greek ὤν, ὄντος (ṓn, óntos, “being”), present participle of εἰμί (eimí, “being, existing, essence”) + λόγος (lógos, “account”). By surface analysis, onto- + -logy. First known English use 1663: Archelogia philosophica nova; or, New principles of Philosophy. Containing Philosophy in general, Metaphysicks or Ontology, Dynamilogy or a Discourse of Power, Religio Philosophi or Natural Theology, Physicks or Natural philosophy, by Gideon Harvey (1636–1702), London, Thomson, 1663. Popularized as a philosophical term by German philosopher Christian Wolff (1679–1754).