A partition is a wall, screen, or divider that separates one part of a room, vehicle, or other space from another. To begin with, Partition is the division of personal or real property between two or more co-owners, such as joint tenants or tenants-in-common.The first step to calculate your share in a partition action is to determine the value of the property. A partition action is a lawsuit that forces the sale or division of jointly owned real property. Overall, a Partition action is a term referencing a division of real property among co-owners into separate portions, i.e. 1. A partition is a wall or screen that separates one part of a room or vehicle from another. A partition action is a type of lawsuit pertaining to joint owners of real property. You need to file the suit in the county and state where the property lies. You need to consult with a property attorney up there.