Property with ownership by more than one person is known as ______.

The correct term for property owned by more than one person is "co-ownership." Co-ownership broadly encompasses various forms of property ownership where two or more individuals hold an interest in the same property. This can include tenancy in common, joint tenancy, and community property, depending on the specific rights and responsibilities defined by the ownership structure.

In contrast, dual ownership typically refers to two different types of ownership or interests in a property, which does not represent the general concept of multiple individuals owning the same property. The term "estate by severalty" pertains to a situation where property is owned by one individual, signifying sole ownership rather than shared ownership. "Property partnership" suggests a formal business arrangement rather than a legal ownership structure concerning real estate specifically. Therefore, co-ownership is the most accurate definition for property held by multiple individuals.