/kwot'euhr sen ten"euh ree, -sen"tn er'ee/ ; esp. Brit. /kwot'euhr sen tee"neuh ree/ , adj., n., pl., quatercentenaries .
n.
1. a 400th aniversary or its celebration.
adj.
2. pertaining to or marking a period of 400 years; quatercentennial.
[ 1880-85; quater four times + CENTENARY ]