clear·ance/`klɪrəns; ˈklɪərəns/ n 1 [C,U] official permission to do something 〔官方的〕批准，许可: We're waiting for clearance to unload the ship. 我们正在等待办理从船上卸货的手续。 2 slum/snow/land clearance a process in which something is removed from a place because it is not wanted 清拆贫民窟/铲除积雪/清理土地