Octennial
Chamber's Twientieth Century Dictionary · 1908 · p. 70
ok-ten′i-al, adj. happening every eighth year: lasting eight years.— adv. Octenn′ially .— n. Octocen′tenary , the 800th anniversary of an event. [L. octennis — octo , eight, ann us , a year.]
Readham'da tam maddeyi gor →