keywordPronunciation: /ˈkiːwəːd/Translate keyword | into French | into Italian | into Spanish Definition of keyword noun 1a word which acts as the key to a cipher or code. 2a word or concept of great significance:homes and jobs are the keywords in the campaign a word used in an information retrieval system to indicate the content of a document. a significant word mentioned in an index: keywords entered by the indexerkeyword in other Oxford dictionaries Definition of keyword in the US English dictionary