Where does “cœmeterium” come from?

cœmeterium (English) comes from Latin coemētērium, from Ancient Greek κοιμητήριον, from Ancient Greek κοιμάω, from Proto-Indo-European ḱey- — to be lying down; to settle.

cœmeterium (English): An ancient cemetery, churchyard, or burial ground

Definitions

An ancient cemetery, churchyard, or burial ground

Ancestry of “cœmeterium”, step by step

Step	Language	Word	Meaning
1	Latin	coemētērium	cemetery, churchyard, burial ground
2	Ancient Greek	κοιμητήριον	sleeping chamber
3	Ancient Greek	κοιμάω	put to sleep, lull; to sleep
4	Proto-Indo-European	ḱey-	to be lying down; to settle

Every word from Proto-Indo-European ḱey- →Every word from Ancient Greek κοιμάω →Every word from Ancient Greek κοιμητήριον →