Decrease in measurement uncertainty obtained by measuring intensity at many different
wavelengths simultaneously, as is done, for example, in Fourier-transform spectroscopy.
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 755 (https://doi.org/10.1515/pac-2019-0203)