keyword

1. Any word used as the key to a code.
2. Any word used in a reference work to link to other words or other information.
3. 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. A reserved word used to identify a specific command, function, etc.
5. Any word that occurs in a text more often than normal.

الجمع keywords