federation
fed.er.a.tion \.fed-*-'ra--sh*n\ n 1: the act of federating; esp : the formation of a federal union 2: something formed by federation : as 2a: a federal government 2b: a union of organizations
Webster's English Dictionaryfed.er.a.tion \.fed-*-'ra--sh*n\ n 1: the act of federating; esp : the formation of a federal union 2: something formed by federation : as 2a: a federal government 2b: a union of organizations