A method of description of transition metal–ligand interactions and main group stereochemistry, whose basic assumption is that the strength of a bond formed using atomic orbitals on two atoms is related to the magnitude of overlap of the two orbitals.
Source:
PAC, 1999, 71, 1919. 'Glossary of terms used in theoretical organic chemistry' on page 1923 (https://doi.org/10.1351/pac199971101919)