Definition of "Missouri"

A state in the Midwestern region of the United States. Capital: Jefferson City. Largest city: Kansas City.  examples

The longest river in North America, rising in the Rocky Mountains of western Montana and flowing roughly southeast over 2,300 miles through North Dakota, South Dakota, Nebraska, Iowa, Kansas and Missouri, before joining the Mississippi at St. Louis.  examples

An indigenous Siouan tribe that originally lived in the Great Lakes region of United States.  examples

(historical) A massive former territory (1812–1821) of the United States, comprising much of the Great Plains and Midwestern regions.