一いっ党とう優ゆう位い政せい党とう制せい

noun

dominant-party system; one-party dominant system

A political system where one party consistently dominates elections and governance, though other parties exist and may compete.

• 戦せん後ごの日本にほんは長ながらく一いっ党とう優ゆう位い政せい党とう制せいだった。

  Postwar Japan was a dominant-party system for a long time.