Definitions of keyword:
  • noun:   (cryptography) Any word used as the key to a code.
  • noun:   (information science) Any word used in a reference work to link to other words or other information.
  • noun:   (programming) A reserved word used to identify a specific command, function, etc.
  • noun:   (linguistics) Any word that occurs in a text more often than normal.
  • verb:   (transitive) To tag with keywords, as for example to facilitate searching.

(Definitions from Wiktionary)

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