Definition & Meaning of "index"

Index

NOUN

the finger next to the thumb

a system that provides the amount of prices, costs, etc. so that one can compare them with their previous value

an alphabetical list of subjects, names, etc. along with the page numbers each of them occurs, coming at the end of a book

What is an "index"?

An index is a list of key terms, subjects, or topics mentioned in a book, usually found at the end. It is organized alphabetically and provides page numbers where each item can be found within the text. The index helps readers quickly locate specific information or topics in the book, making it easier to navigate large or detailed works. It is commonly used in nonfiction books, academic texts, and reference materials.

a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time

a mathematical notation indicating the number of times a quantity is multiplied by itself

to index

VERB

to systematically organize and list items for easy reference or retrieval

adjust through indexation

provide with an index

Example

The company's performance index showed steady growth in sales and profitability over the last quarter.

The corresponding page numbers in the index led readers directly to the relevant chapters in the book.

Denmark consistently ranks high in global democracy indices due to its strong democratic institutions, commitment to human rights, and robust civil liberties.

Let's turn to the index to find that reference.

The limit of a sequence is the value it approaches as the index goes to infinity.