In a binary protein-ligand complexation process, a geometric free-energy cost, often called conformational or preorganizational free energy, is the free-energy change required to bring the apo conformation to the holo conformation of the molecules. Similarly, geometric free energy is also associated with a binary complex to change from its energetically minimum state to another configuration to recruit the third body during ternary complex formation. However, this geometric free energy is not captured in binary binding free energy and needs to be described additionally.