名詞 bicentennial:

1. the 200th anniversary (or the celebration of it)
   同義詞：bicentenary

形容詞 bicentennial:

1. of or relating to or completing a period of 200 years
   同義詞：bicentenary

1. For various reasons, the House and Senate, in their bicentennial year, have gotten off to an even slower start than usual.
   由于種種原因，眾參兩院在這兩百周年里，一開始[議程進度]就比往常遲緩。

bi.cen.ten.ni.al

adj.（形容詞）
Happening once every 200 years.
每二百年發(fā)生一次的
Lasting for 200 years.
持續(xù)二百年的
Relating to a 200th anniversary.
二百年紀念的
n.（名詞）
A 200th anniversary or its celebration.Also called bicentenary
二百周年紀念或慶祝也作 bicentenary