Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “index”

See all translations

index

noun [C]  /ˈɪn·deks/ ( plural indexes  /ˈɪnˌdek·səz/ or indices  /ˈɪn·dəˌsiz/) us  

index noun [C] (LIST)

writing an alphabetical list, such as one printed at the back of a book showing on which page a name or subject appears, or computer information ordered in a particular way: If you want to find the place in the text that Henry James is mentioned, look it up in the index.

index noun [C] (COMPARISON)

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.

index

verb [T]  /ˈɪn·deks/ us  

index verb [T] (MAKE LIST)

to prepare an index for a book, or to arrange information in an index: He organized and indexed the material by computer.

index verb [T] (MAKE COMPARISON)

to vary a system of numbers against another or against a fixed standard: Social Security payments are indexed to (= adjusted to allow for) inflation every year.
(Definition of index from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of index?
Add Cambridge dictionaries to your browser to your website

More American English definitions for “index”

Definitions of “index” in other dictionaries

Word of the Day

pot luck

anything that is available or is found by chance, rather than something chosen, planned, or prepared

Word of the Day

Think long and hard; the language of decisions

by Liz Walter,
January 28, 2015
One of the best ways (perhaps the best way) to improve your English is to learn how words go together in phrases, idioms, or other patterns such as verb/noun or adjective/noun pairs (often called ‘collocations’). This blog looks at some useful phrases and collocations connected with the subject of decisions, something we

Read More 

micro pig noun

January 26, 2015
an extremely small pig, bred to be a pet Micro pigs have become popular pets recently, with famous owners including Victoria Beckham, Paris Hilton and Olympic diver, Tom Daley.

Read More