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Imperial–royal

Title of institutions of the Austrian Empire

The adjective kaiserlich-königlich (usually abbreviated to k. k.), German for imperial–royal, was applied to the authorities and state institutions of the Austrian Empire until the Austro-Hungarian Compromise of 1867, which established the Austro-Hungarian Empire. Thereafter the abbreviation k. k.

From Wikipedia (CC BY-SA). Not a dictionary word, so it lives in Other Names.