An alternative to the simple argument is to suggest that there is a further notion of semantic correctness, one that is not co-extensional with that of (CM) but that is both essential to meaning and normative. Thus, it has been claimed that there is a crucial ambiguity in the notion of correct use (Millar 2004: 160). On the one hand, there is the notion of semantic correctness as in (CM); on the other hand there is the notion of correct use as in “using an expression in accordance with its mea