1. Any of the emperors of the Holy Roman Empire (962-1806), of Austria (1804-1918), or of Germany (1871-1918).
2. Used as the title for such a man.
[German, from Middle High German keiser, from Old High German keisar, from Latin Caesar; see CAESAR.]
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.