Keyword

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A keyword is a word or concept with special significance, in particular any word used as the key to a code or used in a reference work to link to other words or other information.

The term keyword in reference to SEM usually refers to a word or phrase (combination of words, such as 'Chicago Courier Service') used to find relevant and useful web pages.

It may also mean:

or a word which occurs in a text more often than we would expect to occur by chance alone

In a non-computer sense:

This article was originally based on material from the Free On-line Dictionary of Computing, which is licensed under the GFDL.