Look up keyword in Wiktionary, the free dictionary.

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:

• Keyword (computer programming), an identifier in a computer language that indicates a specific command
• Keyword (linguistics), a word that occurs with unexpected frequency in a text,

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

• • Keyword (search), a word or phrase to find information in either physical or electronic libraries
  • Keyword (Internet search), a word or a phrase used to find useful results in internet searches
  • Smart keyword, shortcut for bookmarks in Firefox

In a non-computer sense:

• Keywords: A Vocabulary of Culture and Society - a 1976 book discussing English words and their cultural use
• List of Magic: The Gathering keywords

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