Where does “-tet” come from?

-tet (Old French) comes from Latin -tātem, from Latin -tās, from Proto-Indo-European -teh₂ts, from Proto-Indo-European -teh₂, from Proto-Indo-European -tós — Creates verbal adjectives from verb stems.

Ancestry of “-tet”, step by step

Step	Language	Word	Meaning
1	Latin	-tātem	—
2	Latin	-tās	ty, -dom, -hood, -ness, -ship
3	Proto-Indo-European	-teh₂ts	Used to form nouns representing state of being
4	Proto-Indo-European	-teh₂	Used to form nouns representing state of being
5	Proto-Indo-European	-tós	Creates verbal adjectives from verb stems

Words derived from “-tet”

-tät
-teit

Every word from Proto-Indo-European -tós →Every word from Latin -tās →Every word from Proto-Indo-European -teh₂ →