 The kinds into which we have sorted definitions are not mutually exclusive, nor exhaustive. A stipulative definition of a term may, as it happens, be extensionally adequate to the antecedent uses of the term. A dictionary may offer ostensive definitions of some words (e.g., of color words). An ostensive definitions can also be explicative. For example, one can offer an improvement of a preexisting concept “one foot” thus: “let one foot be the present length of that rod.” In its preexisting use, the concept “one foot” may be quite vague; the ostensively introduced explication may, in contrast, be relatively precise. Moreover, as we shall see below, there are other kinds of definition than those considered so far.