An Emperor

1. The male monarch or ruler of an empire.
2. (political theory) Specifically, the ruler of the Holy Roman Empire; the world-monarch.
3. The fourth trump or major arcana card of the tarot deck.
4. A large, relatively valuable marble in children's games.
5. Any fish of the family Lethrinidae.
6. (entomology) Any various butterflies of the subfamily Charaxinae.

Usage notes

• An emperor is generally addressed as His Imperial Majesty.