keyword
/ˈkiːwɜːd/noun
1- 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。
1.1
- a word which acts as the key to a cipher or code解开密码的关键词。
1.2
- 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。
1.3
- a significant word mentioned in an index（索引中的）关键词。