Original: In the early 1980s, owing to the success both domestically and in Europe of Aberdeen and Dundee United, the pair were known as the New Firm; however, Dundee United have their city neighbours Dundee as close rivals,  and the antagonism was not always reciprocated to the same degree.
Simplified: Aberdeen have no geographically close rivals; their nearest neighbours at the same level are in the city of Dundee, with Dundee United having been their principal rivals in the New Firm in the 1980s.