Sangamonian UK /ˌsæŋ(ɡ)əˈməʊ.ni.ən/US /ˌsæŋ(ɡ)əˈmoʊ.ni.ən/adjective 2noun 1forms 1 adjective2 •Of or from Sangamon •During the last interglacial period in North America, between the Wisconsinan and Illinoian glacial periods. noun1 •Someone from Sangamon. formsSangamonians