What type of ownership does not include multiple owners or partnerships?

Estate in severalty refers to a type of property ownership where a single individual holds full title to a property, without any co-owners or partners. This form of ownership allows the individual complete control over the property and the ability to make decisions independently, including the right to sell, lease, or transfer the property without the need for consent from others.

In contrast, joint tenancy and tenancy in common involve multiple owners, with joint tenancy allowing for equal ownership and rights of survivorship, while tenancy in common permits ownership shares to vary among co-owners. Community property typically involves property acquired during a marriage and is owned jointly by both spouses, again indicating multiple owners.

Thus, estate in severalty is distinct in its lack of shared ownership, making it the correct answer. It embodies the concept of sole proprietary rights, which is essential for understanding different types of property ownership structures.