There are lots of types of joints – carpentry, elbow, marijuana, the main part of a non veggie Sunday dinner…

Other uses for the word include a place to meet someone for a drink, something done in partnership (eg jointly writing a book), cutting up a carcass for food, held or belonging to more than one person (joint account) the contrivance by which two artificial things are joined together (that’s something to do with plumbing, I think) the part of a stem from which a leaf grows, the cement bit between bricks and to prepare something ready to be joined to something else.

If I’ve missed any, please let me know – that way this post will be a joint effort.