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The German Emperor, the Emperor of Austria, or the head of the Holy Roman Empire; in British usage, the Kaiser refers particularly to Wilhelm II of Germany (1859–1941), especially in the context of the First World War.

The word is originally recorded from Middle English (in form cayser), from Old Norse keisari, based on Latin Caesar; the modern English form (early 19th century) derives from German Kaiser.

Kaiser's War a name for the First World War.

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