Where does “idioma” come from?

idioma (Italian) comes from Late Latin idioma, from Ancient Greek ἰδίωμα, from Ancient Greek ἰδιοῦσθαι, from Ancient Greek ἴδιος, from Proto-Hellenic *hwédios.

idioma (Italian): vernacular; idiom; languoid

Definitions

vernacular; idiom; languoid

Ancestry of “idioma”, step by step

Step	Language	Word	Meaning
1	Late Latin	idioma	idiomatic; idiom
2	Ancient Greek	ἰδίωμα	peculiarity, specific property, unique feature;...
3	Ancient Greek	ἰδιοῦσθαι	to make one's own, appropriate to oneself
4	Ancient Greek	ἴδιος	pertaining to self, that is, one's own; private;...
5	Proto-Hellenic	*hwédios	—

Every word from Proto-Hellenic *hwédios →Every word from Ancient Greek ἴδιος →Every word from Ancient Greek ἰδιοῦσθαι →