 Similarly, though a dictionary might offer a definition of “cat” as domestic animal with retractile claws, we would not be inclined to say that “cat” meant domestic animal with retractile claws, though we would admit that cats were such animals. Even if cats are the only domestic animals in existence having retractile claws, it does not seem correct to say that this is the meaning of “cat”. The meaning of a word is more than just an accurate description of the contents of its extension.