index (EN)

noun, noun, verb

noun “index”

1. an alphabetical list at the end of a book that tells you where to find information
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   I found the topic I was looking for by checking the book's index.

noun “index”

1. a small number or symbol written next to a letter or number to show some property
   In H₂O, the '2' is an index indicating there are two hydrogen atoms.
2. a number that shows changes in the level of something in the economy compared to a standard or previous value
   The stock market index fell sharply today.
3. (in computing) a number or key that shows the position of an item in a list or array
   Each element in the array can be accessed using its index.
4. (in computing) a data structure that improves the speed of data retrieval
   The database uses an index to quickly locate data.

verb “index”

1. to create an index for a book or collection of information
   She spent hours indexing the encyclopedia.
2. (in computing) to assign indexes to data to improve access speed
   The search engine indexes new web pages every day.
3. (in economics) to adjust an amount according to changes in a price index
   Their salaries are indexed to inflation.