keyword UK /ˈkiː.wɜːd/US /ˈki.wɝd/noun 5verb 1forms 3 noun5 •Any word used in a reference work to link to other words or other information. •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. •A reserved word used to identify a specific command, function, etc.Each function has an entry address which must be quoted after the USR keyword. — 1982 •Any word used as the key to a code. •Any word that occurs in a text more often than normal. verb1 •To tag with keywords, as for example to facilitate searching. formskeyworded · keywording · keywords