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| English | Basque |
| biotic index Scale for showing the quality of an environment by indicating the types of organisms present in it (e.g. how clean a river is) | indize biotiko |
| environmental index An index of available environmental articles from 1972 to present; also known as Environmental Abstract Annual | ingurugiro-indize |
| indexing of documentation A service which creates a special contents list, containing titles, authors, abstracts, subject headings and other information, to describe a large number of publications and to be used in searchable, machine-readable (or printed) look-up tables | dokumentazio-indexatze |
| saprobic index Indication or measure of the level of organic pollution | saprobio-indize |