parliamentEnglishOxford American Thesaurusparliament noun 1 the Queen's speech to Parliament: the Houses of Parliament, Westminster, the House of Commons, the House of Lords, the Commons, the Lords, the House, the Lower House, the Upper House, the Mother of Parliaments. 2 the Russian parliament: legislature, legislative assembly, congress, senate, chamber, house, upper house, lower house, upper chamber, lower chamber, second chamber, convocation, diet, council, assembly, Chamber of Deputies.