ship images. The Makin Island Raid (occurred on 17 - 18 August 1942) was an attack by the United States Marine Corps on Japanese military forces on Makin Island (now known as Butaritari Island) in the Pacific Ocean.
Biannual is derived from the prefix bi-, which means two, twice, double, doubly, as it comes from the Latin bi-, meaning twice, double, and annual comes from the Old French twelfth century word, annuel, which derives from the Latin annus, year.
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.