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keyword
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As a noun, keyword means any word used as the key to a code. As a verb, it means tag with keywords, as for example to facilitate searching.
Meanings of keyword
6 meaningsnoun
cryptographyAny word used as the key to a code.
information scienceAny word used in a reference work to link to other words or other information.
information scienceAny important word in a text or document, which may be linked to other words or other information, or at least merely listed in the metadata for searches to find.
programmingA reserved word used to identify a specific command, function, etc.
linguisticsAny word that occurs in a text more often than normal.
verb
To tag with keywords, as for example to facilitate searching.
Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).