1Originally: a public assembly of the House of Keys and the Lord of Mann's council, called for the consideration of judicial and administrative matters and the promulgation of laws. In later use: any of the regular sittings of the House of Keys and the Lord of Mann's council (later, the Legislative Council). Also: an annual open-air ceremony, attended by the Lord of Mann (or, more usually, his or her deputy) and the Manx Legislature, at which laws passed during the previous year are promulgated and members of the public can present petitions to the government. Now rare (chiefly in historical contexts).
Since 1765 the Lord of Mann has been the British monarch.
2That part of the legislature of the Isle of Man consisting of the House of Keys and the Lord of Mann's council (later, the Legislative Council) sitting as a single body.
The body formed when the House of Keys and the Legislative Council sit together has supreme authority within the legislature of the Isle of Man and performs a role distinct from that of either of its constituent branches. For this reason, it is sometimes considered to represent a third legislative chamber.
3The members of Tynwald, especially when acting in unison or regarded as having a single purpose, will, etc.
Early 17th century. From Tynwald + court.