What does 世纪 (shì jì) mean in English?

Card 379HSK 2010 Level 4379/586
CARD379
PROGRESS65%
世纪
世紀
shì jì
century; CL:個|个[ge4]

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