Where does “ատ” come from?

ատ (Armenian) comes from Old Armenian այդ, from Old Armenian դո-, from Proto-Indo-European tód, from Proto-Indo-European to-, from Proto-Indo-European só — this; that.

ատ (Armenian): that

Definitions

that

Ancestry of “ատ”, step by step

Step	Language	Word	Meaning
1	Old Armenian	այդ	that
2	Old Armenian	դո-	that
3	Proto-Indo-European	tód	demonstrative pronoun; that; it
4	Proto-Indo-European	to-	it; that; the, that
5	Proto-Indo-European	só	this; that

Every word from Proto-Indo-European só →Every word from Proto-Indo-European to- →Every word from Proto-Indo-European tód →