quartary UK /ˈkwɔːtəɹi/US /ˈkwɔɹtəɹi/noun 2adjective 1forms 1 noun2 •(no longer used, rare) A Roman unit of mass, one-fourth of a Roman pound. •(no longer used, rare) Synonym of quartarius, quarter-sextarius, a Roman unit of liquid measure equivalent to about 0.14 L adjective1 •(nonstandard, no longer used) Synonym of quaternary: Of the fourth rank or order, fourth in a series. formsquartaries
