U.S. state, from Latinized form of Spanish montaña "mountain" (used in South America specifically of the forested region on the eastern slopes of the Andes), from Latin mont-, stem of mons (see mountain). The territorial name was proposed in 1864 by U.S. Rep. James H. Ashley of Ohio when it was created from Nebraska Territory, in reference to the Rocky Mountains, which however traverse only one end of it. Admitted as a state in 1889. Related: Montanan.

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Definitions of Montana from WordNet

Montana (n.)
a state in northwestern United States on the Canadian border;
Synonyms: Treasure State / mt / Mont.