Definition of index noun from the Oxford Advanced Learner's Dictionary

        

    index

     noun
    noun
    BrE BrE//ˈɪndeks//
     
    ; NAmE NAmE//ˈɪndeks//
     
    Economy, Mathematical terminology, Parts of a book
     
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  1. 1  (pl. indexes) a list of names or topics that are referred to in a book, etc., usually arranged at the end of a book in alphabetical order or listed in a separate file or book Look it up in the index. Author and subject indexes are available on a library database. See related entries: Parts of a book
  2. 2(British English) = card index
  3. 3  (indexes, indices
    BrE BrE//ˈɪndɪsiːz//
     
    ; NAmE NAmE//ˈɪndɪsiːz//
     
    )
    a system that shows the level of prices and wages, etc. so that they can be compared with those of a previous date the cost-of-living index The Dow Jones index fell 15 points this morning. stock-market indices house price indexes See related entries: Economy
  4. 4(indices
    BrE BrE//ˈɪndɪsiːz//
     
    ; NAmE NAmE//ˈɪndɪsiːz//
     
    )
    a sign or measure that something else can be judged by The number of new houses being built is a good index of a country's prosperity.
  5. 5 (also indices [plural]) (mathematics) the small number written above a larger number to show how many times that number must be multiplied by itself. In the equation 42 = 16, the number 2 is an index. See related entries: Mathematical terminology
  6. Word Origin late Middle English: from Latin index, indic- ‘forefinger, informer, sign’, from in- ‘towards’ + a second element related to dicere ‘say’ or dicare ‘make known’; compare with indicate. The original sense ‘index finger’ (the finger with which one points), came to mean ‘pointer’ (late 16th cent.), and figuratively something that serves to point to a fact or conclusion; hence a list of topics in a book (“pointing” to their location).Extra examples Although the book was devoted to cancer, the word ‘cancer’ did not even appear in the index. Inflation, as measured by the consumer price index, is expected to drop. Is there any reference to it in the index? It’s a general index to the whole work. Look up ‘The Waste Land’ in the index. Most commodity funds track a specific commodity index. Search the index to find the address of the data file. The Morgan Stanley Cyclical index posted a small advance. The NYSE Financial index gained 20%. The commodities index fell 3.1%. The company is listed on the Nasdaq technology stocks index. The hundred shares index closed down 15 points. The increase in our standard rates will be linked to the consumer price index. The index only gives the main towns. The index was calculated with a computer. The price index is published monthly. The test results were used as an index of language proficiency. The topic I was interested in didn’t appear in the index. Those who lived in the inner cities had a high index of deprivation. We keep a card index of all the titles on the shelves. Why don’t you look up her name in the index? a 28.2 point drop in the FT-SE 100 index a general index calculated from death and population information an index based on incidents causing a loss of production an index covering some 1 700 companies an index designed to measure changes in the volume of industrial production cards in a card index dividends on shares in the index index-linked pensions people dealing in options on the FT-SE 100 index Author and subject indexes are available on the library database. His brother’s name doesn’t even appear in the index. His novels were put on the index of banned books. The detailed index lists all the historical characters referred to in the book.
See the Oxford Advanced American Dictionary entry: index