Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “index”

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

for starters

used to say that something is the first in a list of things

Word of the Day

Come on – you can do it! Phrasal verbs with ‘come’.

by Liz Walter​,
November 19, 2014
As part of an occasional series on the tricky subject of phrasal verbs, this blog looks at ones formed with the verb ‘come’. If you are reading this blog, I’m sure you already know come from, as it is one of the first things you learn in class: I come from Scotland/Spain.

Read More 

ped-text verb

November 24, 2014
to text someone while walking I’m ped-texting, I’m looking down at my phone, 75 percent of the time.

Read More