Gladstonian UK /ɡlædˈstəʊ.ni.ən/US /ɡlædˈstoʊ.ni.ən/adjective 1noun 1forms 3 adjective1 •Of or pertaining to William Ewart Gladstone (1809–1898), British prime minister four times between 1868 and 1894.Their guiding light is the Gladstonian ideal of a low tax, laissez-faire, “night-watchman state”. — 2011 noun1 •A political supporter of William Ewart Gladstone. formsGladstonians · more Gladstonian · most Gladstonian