Majlis (مجلس) is an Arabic term meaning "a place of sitting" used to describe various types of formal legislative assemblies in countries with linguistic or cultural connections to Islamic countries. Also it is the equivalent of the term parliament in some Islamic-culture states like the Maldives. Majlis is also a common term used for a special gathering in remembrance of Husayn ibn Ali, the son of Ali and the grandson of the prophet Muhammad.
Example of majlis (in the sense of legislative assemblies) that exist today:
Azerbaijan - Milli Məclis
Turkey - Türkiye Büyük Millet Meclisi
Iran - Majlis of Iran
Maldives - Majlis of the Maldives
Oman - Majlis of Oman
Saudi Arabia - Majlis of Saudi Arabia
Turkmenistan - Halk Maslahaty and Majlis
Uzbekistan - The Oliy Majlis
The People's Consultative Assembly of Indonesia is known as Majelis Permusyawaratan Rakyat
The National Assembly of Kuwait is the Majlis-al-Umma
The Parliament of Pakistan is known as the Majlis-e-Shoora
Kazakhstan - Majilis
Also, Majlis is an Arabic term for a room in a private home used to entertain family and guests. In some homes there is a women's Majlis and a men's Majlis. It shares its grammatical root with the verb meaning 'to sit' (cf. British English 'sitting room').
The same term is used to describe parties, perhaps most famously musical parties in the 'Abbasid era, and in this sense the concept has been widely adopted throughout the islamic world and beyond. This sense is sometimes now distinguished as an "adabi majlis" ("artistic majlis") and resembles a european salon as a forum for artistic expression, appreciation, and discussion.