The logical aspect of an utterance concerns the way it may lead to other utterances. That aspect is part of its meaning. A semantic description based on this hypothesis will be subdivided into three calculations: (i) attribute to the abstract underlying sentence a signification consisting of a set of informative contents (with illocutionary markers) and argumentative contents at the presupposed level; (ii) deduce new contents by means of axioms and rules; (iii) determine the argumentative orientation of the sentence.