index /inˈdeks/

1. The forefinger (also inˈdex-finger), or the corresponding digit in animals
2. A pointer or hand on a dial or scale, etc
3. A moving arm, as on a surveying instrument
4. The gnomon of a sundial
5. The finger of a fingerpost
6. A figure of a pointing hand, used to draw attention (printing)
7. The nose (old slang)
8. Anything giving an indication
9. A table of contents or other preliminary matter in a book (obsolete)
10. Hence a preface, prologue, introduction (Shakespeare; figurative)
11. An alphabetical register of subjects dealt with in the text of a book, etc, usu located at the end, with page or folio references
12. A similar list of other things
13. A list of prohibited books
14. A direct, or indication of the first notes of the next page or line (music; obsolete)
15. A symbol denoting a power (mathematics)
16. A number, commonly a ratio, expressing some relation (as refractive index, the ratio of sines of angles of incidence and refraction or cranial index, the breadth of a skull as a percentage of its length)
17. A numerical scale showing the relative changes in the cost of living, wages, etc, with reference to some predetermined base level
18. The reciprocal of intercept with parameter as unit (crystallography)

1. To provide with or place in an index
2. To link to an index, index-link

indexˈal adjective

indexāˈtion or inˈdexing noun

A system by which wages, rates of interest, etc are directly linked (index-linkedˈ) to changes in the cost of living index

inˈdexer noun

indexˈical adjective

inˈdexless adjective

index auctorum noun (Latin)

Index of authors

index case noun (medicine)

The first identified case of a disease

Index Expurgatorius noun (Latin; RC)

Formerly, a list of books from which certain passages must be expurged before the books may be read by Roman Catholics

index fossil noun

A fossil species that characterizes a particular geological horizon

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