matureness|məˈtjʊənɪs| [f. mature a. + -ness.] The state of being mature, maturity. 1701–2Narr. Lower Ho. Convoc.Vind. 51 The..Matureness of their final Resolution.1727in Bailey vol. II. 1833 G. R. Porter Trop.Agric. 227 By..extracting a piece of pith, and examining its degree of matureness.