metalanguage
/ˈmetəˌlæŋgwɪdʒ/noun
1- a form of language or set of terms used for the description or analysis of another language元语言（用以描述和分析另一种语言的语言或术语）。比较OBJECT LANGUAGE （义项1）.
1.1
- Logic a system of propositions about propositions【逻】元命题。