quat ‧ er ‧ cen ‧ te ‧ na ‧ ry /ˌkwætəsenˈtiːnəri $ ˌkwɑːtərsenˈten-/ BrE AmE noun ( plural quatercentenaries ) [countable]
[ Date: 1800-1900 ; Language: Latin ; Origin: quater 'four times' + English centenary ]
the day or year exactly 400 years after a particular event
quatercentenary of
the quatercentenary of Shakespeare’s birth