How to say "parliament" in Japanese

• 議会ぎかいJLPT N3approx.Common
  nounThe general word for a legislative assembly: use it for a country's parliament, congress, or diet, as in news reports and political discussion; it denotes the lawmaking body itself.
  議会ぎかいはさいごにけんかになった。↗

  The argument ended in a fight.
• 議院ぎいんCommon
  nounA formal legal term for a house of the legislature, appearing mainly in legal texts and in the names of the Diet's two houses; seldom the standalone word you want for 'parliament'.

For 'parliament' meaning a country's legislature, 議会 is the default choice; 議院 is a formal legal term for a parliamentary house, seen chiefly in legal texts and in the names of the Diet's two houses.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 議会ぎかいcongress
• 議院ぎいんparliament
• パーラメントparliament
• 七並べしちならべfan-tan (game)
• 国会こっかいlegislative assembly