"pertaining to a 200-year period," 1843; see bi- + centenary. Also see bicentennial. As a noun, "a bicentennial anniversary or celebration," also from 1843.
实用例句
1. The company's bicentenary was in 1974.
一九七四年是这公司成立二百周年.
来自《简明英汉词典》
2. Do you have the memorial postage stamps for the bicentenary?