Early 17th century; earliest use found in Henry Cockeram (fl. 1623–1658), lexicographer. From classical Latin grandaevitās great age from grandaevus + -tās.
Definition of grandevity in US English:
grandevity
nounɡranˈdɛvɪti
rare
Great or old age.
Origin
Early 17th century; earliest use found in Henry Cockeram (fl. 1623–1658), lexicographer. From classical Latin grandaevitās great age from grandaevus + -tās.