a. and sb. [CO- 2.]

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  A.  adj. Reigning in conjunction; B. sb. One who reigns in conjunction with another. So Co-regnancy, † Co-regnation.

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1658.  R. Newcourt, Title to Map of London, Sheet 12. The Danes then attempted ye Land and became Co-Regnants for divers yeares.

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1865.  Union Rev., III. 404. The Saints coregnant with Christ.

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1886.  Expositor, Dec., 448. The co-regnancy with the Lord that is promised to the suffering believer.

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1654.  trans. Scudery’s Curia Pol., 84. Was it impossible for Cæsar and Pompey … to have contrived a Co-regnation?

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