Thus we know what it means to speak, relative to a given grammar and qualified in cases of ambiguity by 'on a meaning' or 'on all meanings', of the category and intension of any meaningful expression; of the extension at a given index of any expression of appropriate category; of the thing named by a name; of the things to which a common noun applies; of the truth at an index, truth on an occasion, analyticity, logical truth, etc.