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Meta language

SEMANTICS: the language that is used to talk about (expressions of) another language, the object language. Object language and meta language can be the same, e. g. ordinary English, but they always differ in function. If we cannot detect any meta language in a sentence, there is no object language either. The distinction was introduced to avoid the liar's paradox.

LIT.	Gamut, L.T.F. (1991)