Where does “شاهنشاهی” come from?

شاهنشاهی (Persian) comes from Persian شاهنشاه, from Persian شاهان‌شاه, from Middle Persian 𐭬𐭫𐭪𐭠𐭭 𐭬𐭫𐭪𐭠, from Middle Persian 𐭬𐭫𐭪𐭠, from Old Persian 𐏋, from Proto-Iranian xšáyati, from Proto-Indo-Iranian kšáyati, from Proto-Indo-European teḱ- — to sire, beget.

شاهنشاهی (Persian): imperial

Definitions

imperial

Ancestry of “شاهنشاهی”, step by step

Step	Language	Word	Meaning
1	Persian	شاهنشاه	shahanshah
2	Persian	شاهان‌شاه	—
3	Middle Persian	𐭬𐭫𐭪𐭠𐭭 𐭬𐭫𐭪𐭠	king of kings, shahanshah
4	Middle Persian	𐭬𐭫𐭪𐭠	king
5	Old Persian	𐏋	king
6	Proto-Iranian	xšáyati	—
7	Proto-Indo-Iranian	kšáyati	he rules, he has power over
8	Proto-Indo-European	teḱ-	to sire, beget

Every word from Proto-Indo-European teḱ- →Every word from Proto-Indo-Iranian kšáyati →Every word from Proto-Iranian xšáyati →