What does 皇帝 (huáng dì) mean in English?

Card 430HSK 2010 Level 5430/1311
CARD430
PROGRESS33%
皇帝
huáng dì
emperor; CL:個|个[ge4]

Reveal: Click/Space/Enter/↑↓/w/s/j/kNavigate: ←→/h/l/a/d