1. pertaining to a 200th anniversary.

Is biannual twice a year or once every two years?

When we describe something as biannual, we can mean either that it occurs twice a year or that it occurs once every two years. ... Some people prefer to use semiannual to refer to something that occurs twice a year, reserving biannual for things that occur once every two years.

What is the meaning for bicentenary?

US bicentennial (ˌbaɪsɛnˈtɛnɪəl)

/ (ˌbaɪsɛnˈtiːnərɪ) / marking a 200th anniversary. occurring every 200 years. lasting 200 years.