The term "block-local" refers to the strict localization of molecular orbitals (BLMO) in WFT or Kohn-Sham orbitals in DFT (BLKS) in the complex (𝑋𝑋 • 𝑌𝑌). They are strictly localized within the two individual molecular fragments because BLMOs are expanded over basis orbitals on the atoms in each monomer. Δ𝐸𝐸 Lint [(𝑋𝑋 • 𝑌𝑌)] includes classical Coulomb interaction, quantum-mechanical exchange-repulsion and polarization energies, plus the energy change from the equilibrium geometries of isolated monomers to that in the excimer. This classification follows exactly the convention used in the BLW-ED analysis, similar to other ground-state EDA models. It is identical to the total binding energy of the complex (XY), at the given geometry, without the charge-transfer term. Since these are ground-state properties which have been thoroughly explored in the past, we do not further separate and discuss them in this work. Specific details may be found in references .