Definition of "keyword" in English

noun

1. (cryptography) Any word used as the key to a code.

2. (information science) Any word used in a reference work to link to other words or other information.

3. (information science) Any important word in a text or document, which may be linked to other words or other information, or listed in the metadata for searches to find.

4. (programming) A reserved word used to identify a specific command, function, etc.

5. (linguistics) Any word that occurs in a text more often than normal.

verb

1. (transitive) To tag with keywords, as for example to facilitate searching.