Please explain Kötnerei, Halbmeier, Halbkötner

Hello wise and helpful list members,
While doing some research on my BARTELS ancestors in Martfeld, I found a few common terms that I have not been able to translate. I think they relate to the person's status, or to their land and/or property. Can someone please explain what these are?
KötnereiHalbmeierHalbkötner
Thanks,Kathy StahlmanTexas

Hallo kathy,
you can find an explanation here:

Best regards
Alexa (Röttger)