cumulativeness|ˈkjuːmjʊlətɪvnɪs| [f. as prec. + -ness.] Cumulative quality or character. 1872Contemp.Rev. XX. 619 This cumulativeness of knowledge is a result of the principle of its relativity.1889Theological Monthly Jan. 49 A certain cumulativeness of style..culminating in a grand finale of enthusiasm.