Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “index”


noun [C]
(plural indices, indexes) FINANCE, ECONOMICS a system that measures the present value of something when compared to its previous value or a fixed standard: The house price index estimates the change in the value of the nation's housing stock. a bond/share/stock indexan index of sth The fund tracks an index of the UK's top 350 UK shares.
(plural indices) a sign or measure of something: an index of sth Unemployment levels provide a useful index of the state of the economy.
(plural indexes) an alphabetical list that shows you where information is found in a book, on a website, etc.: a searcheable index online indexes to articles and reports
(plural indexes) a collection of information that is stored in alphabetical order: I keep an index of all my clients' contact details.
→ See also All-Share index, All-Stock index, average earnings index, benchmark index, Brand Development Index, card index, consumer confidence index, consumer price index, cost of living index, diffusion index, the Dodge index, the Eurostoxx 50 (Index), FTSE™ 100, FTSE™ 250, FTSE™ All-Share Index, FTSE Eurotop™ 100 Index, FTSE Fledgling Index, FTSE SmallCap Index, Goldman Sachs™ Commodity Index, the Hang Seng (Index), industrial output index, industrial sentiment index, the IPOX 100 Index, misery index, Nikkei index, price index, producer price index, Purchasing Managers' index, retail price index, Russell 2000 index, share index, stock index, sustainability index, Target Group Index™, Thirty-Share Index, All-Share index, weighted index, wholesale price index
(Definition of index noun from the Cambridge Business English Dictionary © Cambridge University Press)
What is the pronunciation of index?
Add Cambridge dictionaries to your browser to your website

Definitions of “index” in other dictionaries

Word of the Day


the occasion when someone performs or presents something to the public for the first time

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 

silver splicer noun

November 17, 2014
informal a person who marries in later life Newly retired and now newlywed – rise of the ‘silver splicers’ Reaching pension age becomes a trigger to tie the knot as baby-boomers begin to redefine retirement

Read More