I. SD
written abbreviation for ↑ South Dakota
II. South Da ‧ ko ‧ ta /ˌsaʊθ dəˈkəʊtə/ BrE AmE written abbreviation , SD
a state in the northern part of the central US, north of Nebraska and south of North Dakota. Its largest city is Sioux Falls. Its main industry is farming, and it produces a lot of meat and grain.