severalty

n. A state of separation from the rest, or from all others; a holding by individual right. [ 1913 Webster ]

Forests which had never been owned in severalty. Bancroft. [ 1913 Webster ]

Estate in severalty (Law), an estate which the tenant holds in his own right, without being joined in interest with any other person; -- distinguished from joint tenancy, coparcenary, and common. Blackstone. [ 1913 Webster ]