Where does “ontologia” come from?

ontologia (Latin) comes from Ancient Greek ὤν, from Ancient Greek εἰμί, from Proto-Hellenic ehmi, from Proto-Indo-European h₁ésmi, from Proto-Indo-European h₁ēs- — to be.

Ancestry of “ontologia”, step by step

ontologia traces back through two separate lines of ancestry.

via Ancient Greek ὤν

Step	Language	Word	Meaning
1	Ancient Greek	ὤν	present participle of εἰμί; actual, real
2	Ancient Greek	εἰμί	To be, exist; live; To be; it is possible
3	Proto-Hellenic	ehmi	to be
4	Proto-Indo-European	h₁ésmi	first-person singular present indicative of...
5	Proto-Indo-European	h₁ēs-	to be

via Ancient Greek λόγος

Step	Language	Word	Meaning
1	Ancient Greek	λόγος	That which is said: word, sentence, speech,...
2	Ancient Greek	λέγω	I put in order, arrange, gather; I choose, count,...
3	Proto-Indo-European	leǵ-	to gather, collect, with derivatives meaning to...

Words derived from “ontologia”

Every word from Proto-Indo-European h₁ēs- →Every word from Proto-Indo-European h₁ésmi →Every word from Proto-Hellenic ehmi →