disposition function (Elucidation) A function is a disposition that exists in virtue of its bearer's physical make-up & this physical make-up is something the bearer possesses because it came into being either through evolution (in the case of natural biological entities) or through intentional design (in the case of artefacts) in order to realize processes of a certain sort 064-BFO The function of a hammer to drive in nails; the function of a heart pacemaker to regulate the beating of a heart through electricity function