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(information science)
A measure of how closely a given object (file, web page, database record, etc.) matches a user's search for information.

The relevance algorithms used in most large web search engines today are based on fairly simple word-occurence measurement: if the word "daffodil" occurs on a given page, then that page is considered relevant to a query on the word "daffodil"; and its relevance is quantised as a factor of the number of times the word occurs in the page, on whether "daffodil" occurs in title of the page or in its META keywords, in the first N words of the page, in a heading, and so on; and similarly for words that a stemmer says are based on "daffodil".

More elaborate (and resource-expensive) relevance algorithms may involve thesaurus (or synonym ring) lookup; e.g. it might rank a document about narcissuses (but which may not mention the word "daffodil" anywhere) as relevant to a query on "daffodil", since narcissuses and daffodils are basically the same thing. Ditto for queries on "jail" and "gaol", etc.

More elaborate forms of thesaurus lookup may involve multilingual thesauri (e.g. knowing that documents in Japanese which mention the Japanese word for "narcissus" are relevant to your search on "narcissus"), or may involve thesauri (often auto-generated) based not on equivalence of meaning, but on word-proximity, such that "bulb" or "bloom" may be in the thesaurus entry for "daffodil".

Word spamming essentially attempts to falsely increase a web page's relevance to certain common searches.

See also subject index.
This article is provided by FOLDOC - Free Online Dictionary of Computing (
References in periodicals archive ?
First, they demonstrate that irrelevant tones disrupt memory for visually presented targets.
Most of the irrelevant sound work has appeared not in the human factors literature but, rather, in the domain of the theoretical study of memory and attention.
According to the police department's spokesman a total of 16162 complaints of varied nature against the department itself were registered in a period pertaining to January to June 2019 and of these 8483 were found to be true hence immediate redressal was ensured while another 7679 are under investigation, 418 were established to be fake and 405 irrelevant.
The post IPC irrelevant to execution of ECHR judgments, Cypriot applicant tells Strasbourg appeared first on Cyprus Mail .
Take it from Miche and me: Irrelevant is the new Influencer!
" I understand the club have spent a lot of money but I think the price tag for a player is irrelevant.
The source of irrelevant sound interferences (by verbal or musical stimuli) has been considered controversial and may be related to different processes (Baddeley, 2007, 2012; Chein & Fiez, 2010; Eagan & Chein, 2012; Jones & Tremblay, 2000).
While addressing Saghir Qureshi, president of PPP district Hyderabad said as the PTI ruled the country, non stability and price hike was increasing and they were introducing irrelevant policies.
We have also had reams upon reams of reports to try and satisfy the drainage proposals - all based on what I would consider to be irrelevant information.
They said the police in the northern Uttar Pradesh state were also wrong in finding about their residence and other irrelevant details while conducting verification process, required to issue an passport.
The NAB chief further directed to ensure complete security of visitors, applicants and staff of NAB at all cost and it must be ensured that official record should go out from NAB headquarters and regional bureaus only for official purpose and leakage of any official information to irrelevant and private persons would be discouraged.
Leader of Pakistan Muslim League-Nawaz (PML-N), Maryam Nawaz has said that JIT report is irrelevant in the Avenfield case.