 Gazdar 1979. PRAGMATICS = MEANING — TRUTH CONDITIONS. What we need in addition is some function that tells us about the meaning of utterances. (…) The domain of this pragmatic function is the set of utterances, which are pairs of sentences and contexts, so that for each utterance, our function will return as a value a new context: the context as changed by the sentence uttered. (…) And we can treat the meaning of the utterance as the difference between the original context and the context arrived at by utterance of the sentence. [This applies to only] a restricted subset of pragmatic aspects of meaning.