- a state in the south central United States. 69,919 square miles (181,090 square kilometers). Capital: Oklahoma City. Abbreviations: OK (for use with zip code), Okla.
- a state in the S central US: consists of plains in the west, rising to mountains in the southwest and east; important for oil. Capital: Oklahoma City. Pop: 3 511 532 (2003 est). Area: 181 185 sq km (69 956 sq miles)
