Ownership is the state of owning something. Anything that people own or possess gives them the quality of ownership. Wars are often fought over the ownership of land.
When you buy a book, you own it. Add the suffix ship to owner, and now you have ownership of that lovely book. If you buy a house, you have ownership of it. Politicians like to talk about the “American dream of home ownership.” If you buy a lottery ticket, you have ownership of that, too. If you win big, you’ll have ownership of lots of cash and then you, too can realize that American dream.