What does 空隙 (kòngxì) mean in English?

Card 1497HSK Level 41497/3571
CARD1497
PROGRESS42%
空隙
kòngxì
interspaced; lacuna(Noun)
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Reveal: Click/Space/Enter/↑↓/w/s/j/k•Navigate: ←→/h/l/a/d