Where does “coemeterium” come from?

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

Ancestry of “coemeterium”, step by step

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