attenuance, D

https://dx.doi.org/10.1351/goldbook.A00513
Analogous to absorbance, but taking into account also the effects due to scattering and luminescence. It was formerly called extinction.
Source:
See also:
PAC, 1996, 68, 2223 (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2228
PAC, 1996, 68, 957 (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 962