Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “index”

index

noun [C] (COMPARISON)   /ˈɪn·deks/ (plural indexes  /ˈɪnˌdek·səz/ or indices  /ˈɪn·dəˌsiz/)
a number used to show the value of something by comparing it to something else whose value is known: a wage/price index fig. The rate of consumer spending is often thought to be an index of public confidence (= show the state of the public’s confidence) in the health of the economy.
(Definition of index noun (COMPARISON) from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of index

Definitions of “index” in other dictionaries

Word of the Day

generous

willing to give money, help, kindness, etc., especially more than is usual or expected

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More