Decade (?), n. [F. décade, L. decas, -adis, fr. Gr. &unr_;, fr. deka ten. See Ten.] A group or division of ten; esp., a period of ten years; a decennium; as, a decade of years or days; a decade of soldiers; the second decade of Livy. [Written also decad.]
[1913 Webster]

During this notable decade of years. Gladstone.