Bicentenary is a word commonly used to refer to a 200th anniversary of an event or a person's birth. However, there are many synonyms that can be used as alternative terms for bicentenary such as bicentennial, two-hundredth anniversary, bi-centennial, and double century. Some other synonyms that are less commonly used include 200th year celebration, two centuries mark, and 200-year milestone. Depending on the context, other terms such as sesquicentennial (150th anniversary) or quasquicentennial (125th anniversary) may also be used instead of bicentenary. Whatever term is used, the meaning remains the same- a significant milestone marking a period of 200 years.