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SEMANTICS: an expression of a meta language, that can be used to refer to arbitrary object language expressions in a logical language. EXAMPLE: the syntax definition of a predicate logic could contain sentence (i).

(i) If phi is a formula in L, then so is Neg phi
In (i), phi is a metavariable standing for any formula of the logical language L.
LIT. Gamut, L.T.F. (1991)