What term refers to property held jointly by individuals, whether they are married or unmarried?

The term that refers to property held jointly by individuals, regardless of their marital status, is commonly understood as "Co-Ownership." While joint tenancy is a specific type of co-ownership that includes rights of survivorship, it is not the broad term that encompasses all situations of shared ownership.

Co-Ownership can include various arrangements such as joint tenancy, tenancy in common, and others, making it the correct choice in this context. It recognizes the shared nature of the property held by individuals and signifies that both parties have ownership rights in the property.

In contrast, joint tenancy specifically requires four unities: time, title, interest, and possession, and it allows for the right of survivorship, where the property automatically passes to the surviving owner upon death. Ownership in severalty denotes sole ownership, and therefore does not apply to the situation described in the question. Tenancy in common, while another form of co-ownership, doesn't imply joint ownership in the same broad context as co-ownership does. Thus, co-ownership is the most accurate term that captures the essence of jointly held property among individuals.