institutionalism comes from institutional (from Latin institutio 'arrangement, instruction', from instituere 'to set up, establish', from in- + statuere 'to set up', from status 'standing') + the suffix -ism. Morphologically, the ending is part of the etymology: the suffix is attached to the older base named in the history, producing a later English derivative. In present English, the noun sense is "emphasis on established institutions, or the effects of prolonged institutional life", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as institution, institute, institutional, and institutionalize, and in derivatives such as institutionalist. Its semantic neighborhood includes traditionalism and conventionalism, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Latin in-, Latin statuere, and Latin stare.