- annual
- late 14c., from O.Fr. annuel, from L.L. annualem (nom. annualis), corresponding to L. annalis as adjective form of annus "year," from PIE *at-no-, from base *at- "to go," on notion of "period gone through" (cf. Skt. atati "goes, wanders," Goth. ažnam (dat. pl.) "year," Oscan akno- "year, holiday, time of offering"). Used of plants since 1710.