55年体制 [ごじゅうごねんたいせい] /(n) (See 自由民主党・じゆうみんしゅとう・1,日本社会党・にっぽんしゃかいとう) (hist) 1955 System/Japanese political alignment with the LDP in government and the JSP in opposition, which lasted until 1993/EntL2685880/