a state of the US in the central Pacific, consisting of over 20 volcanic islands and atolls, including Hawaii, Maui, Oahu, Kauai, and Molokai: discovered by Captain Cook in 1778; annexed by the US in 1898; naval base at Pearl Harbor attacked by the Japanese in 1941, a major cause of US entry into World War II; became a state in 1959. Capital: Honolulu. Pop: 1 257 608 (2003 est). Area: 16 640 sq km (6425 sq miles)