quingenary UK /kwɪnˈd͡ʒiːn(ə)ɹi/US /kwɪnˈd͡ʒɛn(ə)ɹi/adjective 1noun 1forms 1 adjective1 •(historical) Of or related to units of 500 men. noun1 •(rare) Synonym of quincentennial: A 500th anniversary. formsquingenaries