1. quadricentennial - Noun
2. quadricentennial - Adjective
quadricentennial (not comparable)
Relating to a 400th anniversary.
quadricentennial (plural quadricentennials)
A 400th anniversary.
NAGA CITY, September 9, 2016 (Bicol Standard) -- The Quadricentennial Arch at the Naga Metropolitan Cathedral is adorned with elaborate flower arrangements for the Solemn Pontifical Concelebrated Mass at 5:30 p.m. after the Traslacion procession today. Source: Internet