If someone is propertied, they own a lot of property or land — houses, farms, buildings that count as wealth. It is an adjective, a little old-fashioned and quite formal. History books talk about the propertied classes: the people who owned the land and the houses, as opposed to people who only rented or worked. You would not usually say “I’m propertied” about having one small flat; the word carries “well-off, landed.” Though actually, it is about owning, not about being good with money or having a high salary. A person can earn a lot and still not be propertied if they own little, and a family can be propertied without looking flashy. You will meet it in history, politics, and law more than in everyday chat.