Etymology
The English word index comes from Latin index, meaning “a discoverer, informer, spy; an indicator, the forefinger, a title, or superscription.” It derives from indicō, “to point out, show,” related to the verb indicate.
Pronunciation
In Received Pronunciation and General American English, it’s pronounced /ˈɪn.dɛks/ (IN-deks), with primary stress on the first syllable. In Australian English, it’s /ˈɪn.dɛks/. The ‘i’ sounds like the ‘i’ in “pin,” and the ‘e’ like in “bed.”
Meanings
Noun: An index is primarily an alphabetical list of names, subjects, or items with page numbers at the end of a book, aiding quick reference. It can also mean the forefinger (index finger), a pointing device on gauges, or a symbol (like a hand) in texts. In economics, it’s a number tracking changes in prices or quantities, such as the Consumer Price Index. In computing, it’s a key for data location in arrays or databases. In math, it’s an exponent or coefficient.
Verb: To index means to create an index for a document, adjust for inflation (e.g., index wages to the cost of living), or access data by its position in programming.
Morphology and Grammar Notes
As a noun, index is countable; plural forms are indexes (common in American English) or indices (preferred in technical and British English). The verb conjugates regularly: indexes, indexing, indexed. It’s often used in technical contexts, so precision in plural form matters in fields like math or computing.
Short Interesting Facts
The term “index finger” dates back to its use in ancient Rome for pointing, linking to its role in gestures. In publishing history, indexes revolutionized book navigation post-printing press. Fun fact: In libraries, the card index system (now digital) was named after this word, evolving into modern search engines.
Tips for Learning
Associate index with “pointing”: visualize a finger pointing to a page number. Practice by indexing your notes—list key terms alphabetically. Use mnemonics like “In-Dex points the way” for the pointer meaning.
Cultural and Contextual Features
In Western culture, the index finger is used for pointing, symbolizing direction or accusation. Economically, stock market indexes like the Dow Jones reflect societal health. In web design, “index.html” is the default homepage, a nod to its listing origin.
Examples
Simple: Check the book’s index for the topic.
Medium: The economist analyzed the price index to predict inflation trends.
Complex: In database management, developers index columns to optimize query performance, ensuring faster retrieval of large datasets during peak usage.
Synonyms, Antonyms, and Common Combinations
- Synonyms (noun): Directory, catalog, list; (finger) forefinger; (economics) indicator.
- Antonyms: None direct; opposites might be “disorder” for the listing sense or “obscure” for indicating.
- Common combinations: Index finger, price index, card index, search index; verb: index cards, fully indexed.
Mini-Tasks
- Make a sentence using index as a verb in an economic context.
- Find a synonym for index meaning “forefinger” and use it in a sentence.
- List three items from a book’s index and explain why they’re useful.