Where does “erittäinkin” come from?

erittäinkin (Finnish) comes from Finnish erittäin, from Finnish erä, from Proto-Finnic erä, from Proto-Finno-Ugric erä — apart.

Ancestry of “erittäinkin”, step by step

StepLanguageWordMeaning
1Finnisherittäinvery, extremely
2Finnisheräbatch; lot; Short for maksuerä
3Proto-Finniceräapart, separate
4Proto-Finno-Ugriceräapart
Every word from Proto-Finno-Ugric erä →Every word from Proto-Finnic erä →Every word from Finnish erä →