Where does “այտի” come from?

այտի (Old 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.

այտի (Old Armenian): from there, thence; there

Definitions

from there, thence; there

Ancestry of “այտի”, step by step

այտի traces back through two separate lines of ancestry.

via Old Armenian այդ

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

via Old Armenian ի

Step	Language	Word	Meaning
1	Old Armenian	ի	to, in the direction of, towards; with, by; for...
2	Proto-Indo-European	h₁én	in

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