A JOINT PARTNER is a person or entity that works together with another to achieve a common goal. The term can be broken down into two parts: 'JOINT' and 'PARTNER'. A TENON is a type of JOINT in which one end of a piece of wood fits into a mortise, or a hole cut into another piece of wood. A KNEE is a type of JOINT that connects two pieces of wood at an angle. Both of these terms are used to describe a JOINT PARTNER, as they both involve two pieces of wood working together to form a single structure.