a word or concept of great significance 关键词 homes and jobs are the keywords in the campaign. 住房和就业是这场运动的关键词。 ■a word which acts as the key to a cipher or code 解开密码的关键词 ■an informative word used in an information retrieval system to indicate the content of a document 信息检索系统中的关键词 ■a significant word mentioned in an index (索引中的)关键词