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Every countable language which conforms to classical logic is shown to havean extension which conforms to classical logic, and has a definitional theoryof truth. That extension has a semantical theory of truth, if every sentence ofthe object language is valuated by its meaning either as true or as false.These theories contain both a truth predicate and a non-truth predicate.Theories are equivalent when the sentences of the object language are valuatedby their meanings.

Theories of truth for countable languages which conform to classical logic