Definitions
1.nounThe male monarch or ruler of an empire.
2.nounAny monarch ruling an empire, irrespective of gender, with "empress" contrasting to mean when consort to emperor
3.noun(political theory) Specifically, the ruler of the Holy Roman Empire; the world-monarch."The Investiture Controversy was a conflict between the Emperor and the Pope."
4.nounThe fourth trump or major arcana card of the tarot deck.
5.nounA large, relatively valuable marble in children's games.
6.nounAny fish of the family Lethrinidae.
7.nounAny various butterflies of the subfamily Charaxinae.