decennal

== English == === Etymology === From Latin decennālis (“decennial”), from decennis (“10-year”) + -ālis (“-al”, adjective-forming suffix), from decem (“ten”) + annus (“year”) + -is (suffix forming compound adjectives). Equivalent to decennium +‎ -al. === Adjective === decennal (not comparable) (obsolete) Synonym of decennial, of or related to a 10-year period. === References === “decennal, adj.”, in OED Online ⁠, Oxford: Oxford University Press, launched 2000.