What does indexing mean?
Indexing is the practice of creating and maintaining an index, a structured list or arrangement that makes words, topics, records, or other items easier to locate. In books and libraries, indexing can involve selecting precise headings, adding references, and creating cross-references for important subjects. In modern computing, the term usually refers to organizing data in a way that allows software to retrieve matching information quickly, often through specialized data structures. The verb “indexing” describes that process: a program may index documents, a librarian may index a collection, or a publisher may prepare an index for a reference work. Indexing is therefore closely associated with systematic organization and efficient access. While indexing does not necessarily summarize the material, it supplies a controlled route through it, enabling readers or users to find relevant information without examining every item.
The process of creating or using a systematic index to organize words, topics, records, or data so that relevant items can be found efficiently.
"Efficient indexing makes a large digital collection easier to search."
The noun is widely used in publishing, library science, information retrieval, and computing.
To create, assign, or maintain an index for words, topics, records, or data.
"The application is indexing each document as it is imported."
The present participle is common in technical descriptions and can also modify a following noun, as in “indexing software.”
The plural is uncommon because indexing is usually treated as an uncountable process noun.
"The archive produced several separate indexings of the same corpus."
Its ancestor was the Latin index, literally a “pointer”—a fitting origin for a word now essential to databases, libraries, and search engines.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does indexing come from?
Indexing is an English gerund formed from index by adding the suffix “-ing.” The English noun index comes from Latin index, meaning “pointer” or “indicator,” which is related to Latin indicare, “to point out” or “indicate”; related forms include indicate, indication, and indicative. Historically, indexing chiefly concerned locating words, names, or subjects in reference works, while in modern computing it denotes organizing data for efficient retrieval.
Related word forms
How indexing is actually used
The term is formal and especially common in computing, information science, publishing, and library work. As a gerund it commonly expresses an ongoing or technical process; in constructions such as “an indexing system,” it functions attributively.