v. [f. EXTERIOR + -IZE.] trans. To make exterior; to realize (a conception) in outward form; to attribute an external existence to (states of consciousness).
1879. Maudsley, Pathol. Mind, 449. It is the unfailing tendency of the mind to project its affections outwards and to transfer them to objects as qualitiesto exteriorise its states as qualities.
1890. T. Child, in Harpers Mag., May, 821/1. His painting is a means of exteriorizing his conceptions.