Evolution and Definition

The use of tools requires the manipulation of them, and, hence, of the hand with the unique thumb.  Tools must thus conform to the contour of the hand.  Correspondingly, insofar as mental operations are tools, as Spinoza proposes, they must conform to the contour of Mind.  Thus, the Definition is the fundamental Mind-tool maker.  Hence, according to his Mind-Body Parallelism, the power to define corresponds to the potential of the unprecedented Human thumb. In other words, Definition is the distinctively Human Mental operation, and, so, is a product of Evolution, rather than a Modification of God/Nature, as Spinoza's system entails.  Thus, Definition more than clarifies and makes precise--it promotes mental versatility.