mechanical anharmonicity

synonym: anharmonicity
https://doi.org/10.1351/goldbook.08635
Influence of cubic and higher-order terms in vibrational potential energy.
Note:
Mechanical anharmonicity should not be confused with electrical anharmonicity.
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 754 (https://doi.org/10.1515/pac-2019-0203)