Ownership means you are rightfully (i.e. not stolen) in possession of something, you control of its usage, and you are responsible for it.

Examples of things I own: 

My body, my time, my energy, and the products of those things.

Something I own is my property.

 

 Do you consider that land can be owned? Animals?  

 Like children, animals can be your wards, not your property.

You own what you build on the land, not the land itself. You also have the right to insist people not snoop around your property (i.e. trespass) threatening your security.