clearance /ˈkliərəns/ n. ［c］ & ［u］ 1.清除，清理，出空：clearance sale 清仓处理 The car started as soon as it got clearance. 车一有空隙就开走了。 2.许可，批准：You need clearance before you can have access to these confidential files. 你必须得到批准才能看这些机密文件。