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https://doi.org/10.1351/goldbook.A00028
Logarithm of the ratio of incident to transmitted @[email protected] through a sample (excluding the effects on cell walls). Depending on the base of the logarithm a decadic and Napierian absorbance are used. Symbols: $$A$$, $$A_{10}$$, $$A_\text{e}$$. This quantity is sometimes called @[email protected], although the term @[email protected], better called @[email protected], is reserved for the quantity which takes into account the effects of @[email protected] and @[email protected] as well.
Source:
Green Book, 2nd ed., p. 32 [Terms] [Book]