diarchyn.

1835 C. Thirlwall Hist. Greece I. viii. 318 A diarchy, though less usual than a monarchy, was not a very rare form of government.

1885 Academy 10 Oct. 231/2 The imperial government is a Dyarchy, says Dr. Mommsen.

1886 Eng. Historical Rev. 1 350 The ‘dyarchy’ of senate and emperor is taken for granted.

1917 L. Curtis Let. 6 Apr. in Papers Princ. Dyarchy (1920) iii. 105 Self-government in any large country thus involves the operation of two authorities with separate mainsprings side by side. The word ‘dyarchy’..has been coined to denote this principle.

1919 Let. Govt. India Const. Reform 55 in Parl. Papers (Cmnd. 123) XXXVII The only method by which this can be attained is one which involves the division of the functions of government between two different sets of authorities, a method which has been compendiously styled ‘dyarchy’.

1920 H. V. Lovett Hist. Indian Nationalist Movement vi. 163 In the Government of India there was to be no dyarchy, but the Indian element in the Viceroy's Executive Council was to be increased.

1959 Times 24 Feb. 11/2 The proposed constitution is essentially a diarchy. It comprises the two communal chambers, as well as very extensive communal self-government at municipal and local level.

1964 A. Swinson Six Minutes to Sunset i. 9 Montagu proposed..a system known as diarchy, whereby some functions of government should be taken over by the Indians, while others should be retained by the British.