[f. as next + -AD, after decad.] = QUINQUENNIUM.
1842. Tennyson, Day-Dream, L’Envoi ii. Thro’ sunny decads … Or gay quinquenniads.
1878. Dowden, Stud. Lit., 202. Prolonged through many decades and quinquenniads.
1897. Allbutt’s Syst. Med., II. 185. At all ages … except in the quinquenniad ten to fourteen.
