Is it index or indexes?

Answer:
The word index is singular. One index.

If you have more than one, you can form the plural according to Latin conventions:

indices

or according to English conventions:

indexes.

Preference varies from publisher to publisher, and dictionaries differ. Either is correct. Just be consistent within a single document.

Also, if you refer to appendix in the plural, you should do it consistently with your treatment of index: that is, appendices or appendixes.

First answer by ID3175372975. Last edit by SapphireMoon. Contributor trust: 905 [recommend contributor recommended]. Question popularity: 2 [recommend question].