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diarchal

diarchal, a.
  (daɪˈɑːkəl)
  Also diarchial, dyarchal, -ial.
  [f. diarchy + -al.]
  Of or pertaining to a diarchy; spec. (see diarchy).

1921 Glasgow Herald 11 Mar. 10 Among the Ministers recently elected under the new ‘Dyarchal’ system was an Indian who had been previously convicted on charges of conspiracy. 1921 Evening Standard 20 May 4/3 Mr...Sastri..took a prominent part in the dyarchal reforms in India. 1924 Observer 3 Aug. 5/1 In Bengal, the Diarchal plan is in suspense. 1927 Ibid. 27 Mar. 11/2 The diarchial system had to be suspended. Ibid. 13 Nov. 18/2 The dyarchial system [in India]. 1932 Times Educ. Suppl. 1 Oct. 375/3 In a total population in the existing dyarchial provinces (excluding Burma) there are roundly 131,000,000 adults.

Oxford English Dictionary

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