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.
Biweekly means once every two weeks or twice a week. Bimonthly means once every two months or twice a month. In addition, a biweekly publication is issued every two weeks and a bimonthly publication is issued every two months. Semiweekly means twice a week. Semimonthly means twice a month. To avoid confusion, you may want to substitute the actual time frame for these confusing terms.