Where does “εξετάζω” come from?

εξετάζω (Greek) comes from Ancient Greek ἐξετάζω, from Ancient Greek ἐτάζω, from Ancient Greek ἐτός — without reason, in vain; true.

εξετάζω (Greek): examine, investigate, question

Definitions

Step	Language	Word	Meaning
1	Ancient Greek	ἐξετάζω	—
2	Ancient Greek	ἐτάζω	to examine, test
3	Ancient Greek	ἐτός	without reason, in vain; true

εξετάζω — Etymology, Origin & Word History | Etymology Explorer