basis function 

https://doi.org/10.1351/goldbook.BT06998
A one-electron function used in the expansion of the molecular orbital function. Basis functions are commonly represented by atomic orbitals (see also Slater-type orbital or Gaussian-type orbital) centered on each atom of the molecule.
Source:
PAC, 1999, 71, 1919. (Glossary of terms used in theoretical organic chemistry) on page 1925 [Terms] [Paper]
Citation: 'basis function' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.BT06998 RIS BibTex EndNote
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Last revised: February 24, 2014