polytechnic noun 3adjective 1forms 1 noun3 •(Singapore) A three-year post-secondary vocational training institute, equivalent of community college in the U.S. or TAFE in Australia. •(UK, old-fashioned) An educational institute that teaches applied arts and sciences rather than academic subjects. •(no longer used) An exhibition of objects illustrating many arts. adjective1 •That teaches applied arts, sciences, technology, engineering and other academic subjects. formspolytechnics