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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 classic literature ?
Mr Sparkler, finding himself stunned by the words thus heaped upon his inoffensive head, made a brief though pertinent rejoinder; the same being neither more nor less than that he had long perceived Miss Fanny to have no nonsense about her, and that he had no doubt of its being all right with his Governor.
less pertinent than Epaminondas or Homer being there?
It is pertinent to mention here that Zaman also extracted Rs1 billion scam from the anchorperson of a private news channel that later led to the murder of Mureed Abbas in Karachi.
Summary: Jammu (Jammu and Kashmir) [India], Aug 17 (ANI): Advisor to Governor K Skandan on Friday chaired a meeting with the Deputy Commissioners (DC) of Jammu division to review the functioning of their departments and address other pertinent issues.
Summary: The article, 'Forget summer camps let the children be bored' (KT, July 2) made some interesting and pertinent observations.
ISLAMABAD -- The National Accountability Bureau (NAB) tightened noose around Sindh Assembly Speaker Agha Siraj Durrani and expanded the scope of its inquiry in a case pertinent to accumulation assets beyond his sources of income, sources on Wednesday told media.
KARACHI: In a historical verdict, the Sindh High court on Wednesday ordered all the private educational institutes to exempt orphans from every kind of fee.Hearing a case pertinent to orphans, the SHC directed the provincial government to reserve Rs10 mn annually for orphanages in the province.
It is pertinent to mention here that this is sixth joint exercise of the series as part of bilateral military cooperation between both friendly countries.
It is pertinent to mention that NAB had also arrested Opposition Leader in National Assembly Mohammad Shehbaz Sharif in connection with Ashiana scam and he was on physical remand.
He said: 'My colleagues and I came to have an audience with the president to discuss issues pertinent to our country and pertinent to our respective States.
THE row over the scheduling of two semi-finals on the same day rumbles on and on Tuesday @ViewfromGorgie tweeted "Yesterday's question from @mstewart_23 was very pertinent...