Ab initio calculations are quantum chemical calculations using exact
equations with no approximations which involve the whole electronic
population of the molecule.
Source:
PAC, 1997, 69, 1137
(Glossary of terms used in computational drug design (IUPAC Recommendations 1997))
on page 1139
Transformed and rewritten from PDF version (entry
http://www.iupac.org/goldbook/AT06946.pdf)
by: Miloslav Nic, Jiri Jirat, Bedrich Kosata, ICT Prague, Czech Republic