What does 中介 (zhōng jiè) mean in English?

Card 1249HSK 2010 Level 51249/1311
CARD1249
PROGRESS95%
中介
zhōng jiè
to act as intermediary; to link; intermediate; inter-; agency; agent

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