Of, belonging to, or relating to the Sioux or their languages.

Of or designating the Otoe people or their language.

Of, belonging to, or relating to the Dakota or their dialect. Also: of, belonging to, or relating to the Sioux language.

Of, belonging to, or relating to the Lakota or their dialect.

Of, relating to, or designating the Dhegiha language spoken by the Ponca.

Of or pertaining to this people or their language.