Word.ws English Dictionary

Plural of index

regular plural

The plural of index is indexes or indices.

Forms of index

Singularindex /ˈɪndɛks/
Pluralindexes /ˈɪndɛksɪz/
indices /ˈɪndɪsiːz/
Countablecountable

Indexes and indices in a sentence

  • Among the gravity indexes is the severance of diplomatic relations.
  • In other words, we predict that the index for a new pair of materials can be obtained from the indexes of the individual materials, both against air or against vacuum.1963, Richard Feynman, “Chapter 26, Optics: The Principle of Least Time”, in The Feynman Lectures on Physics, volume I
  • You must undrop the table first, and any associated indexes will be automatically undropped.2015, Bob Bryla, OCP Oracle Database 12c Advanced Administration Exam Guide, page 321. From the entry undrop
  • Glindex-style indexes have been used with pronunciation guides and chemical formula diagrams.2007, Glenda Browne, Jon Jermey, The Indexing Companion, page 38. From the entry glindex
  • To save space, sub-subentries—where unavoidable—are generally run-on even in otherwise set-out indexes.2002, R. M. Ritter, editor, The Oxford Manual of Style, London […]: BCA, page 593. From the entry denest

Meaning of index

  1. noun An alphabetical listing of items and their location.
  2. noun The index finger; the forefinger.
  3. noun A movable finger on a gauge, scale, etc.

Full definition of index

Questions about the plural of index

What is the plural of index?
The plural of index is indexes or indices.
Which is correct, indexes or indices?
Both are used. indices is the more common of the two in English writing.
Is index countable?
Index is a countable noun.

Source and license

Adapted from Wiktionary: index (page history and authors) and the entries of its forms. Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws left out forms marked obsolete, archaic, rare or dialectal and added the examples. Wiktionary data of 2026-09-02.

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