Terms that can still be found in the literature, but can be expressed more logically in newer terms.
See Guidelines for Drafting Reports 6. Constructing a Terminology Entry in a Glossary
Obsolete terms: "Add if necessary. Deprecated terms include those that have been in common use, but are not compatible with IUPAC recommendations; e.g., 'number of moles of X' instead of the recommended 'amount of X'. Obsolete terms include those that may be encountered in older literature, but are no longer in use; e.g., 'gram-molecular weight'. Superseded terms include those that can still be found in the literature, but can be expressed more logically in newer terms; e.g., 'specific gravity' instead of the more logical 'relative density'. The distinction between 'obsolete' and 'superseded' terms is clearly somewhat arbitrary. It is not expected that many terms will appear in glossaries under these classifications."
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