a state of the northwestern US: consists chiefly of ranges of the Rocky Mountains, with the Snake River basin in the south; important for agriculture (Idaho potatoes), livestock, and silver-mining. Capital: Boise. Pop: 1 366 332 (2003 est). Area: 216 413 sq km (83 557 sq miles) Abbreviation Id., Ida., (with zip code) ID
c.1860, as a place name, originally applied to part of what is now eastern Colorado (Idaho Territory organized 1863; admitted as a state 1890); from Kiowa-Apache (Athabaskan) idaahe "enemy," a name applied by them to the Comanches.