What does 空间 (kōng jiān) mean in English?

Card 575HSK 2010 Level 5575/1311
CARD575
PROGRESS44%
空间
空間
kōng jiān
space; CL:個|个[ge4]
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Reveal: Click/Space/Enter/↑↓/w/s/j/k•Navigate: ←→/h/l/a/d