Regarding Facilities and Areas and the Status of United States Armed Forces in Japan, signed at Tokyo on January 25, 2008, Noting situations involving both countries,
Familiarity information: BICENTENNIAL used as a noun is very rare. â¢ BICENTENNIAL (adjective). The adjective BICENTENNIAL has 1 sense: 1. of or relating to or completing a period of 200 years. Familiarity information: BICENTENNIAL used as an adjective is very rare.
RE: A word for &quot;every four years&quot;? If biannual is every two years, is there a word for an event occurring every four years?est Answer: Annual - 1 year Biennial - 2 years Triennial - 3 years Quadrennial - 4 years Quinquennial - 5 years Sexennial - 6 years Septennial - 7 years Octennial - 8 years Novennial - 9 years Decennial - 10 years Good luck, hope this helps.