/'klɪərəns; `klɪrəns/
n
1 [C, U] (act of) clearing, removing or tidying sth 清理、清除或整理某事物
*`slum clearance, ie knocking down of slum houses 清拆贫民窟（拆除贫民窟的房屋）
* [attrib 作定语] a `clearance sale, ie one in which all unwanted stock in a shop is sold at reduced prices （商店）清货大贱卖.
2 [C] (in football, hockey, etc) act of kicking or striking the ball away from the goal （足球、 曲棍球等）将球踢出或击出球门区的动作
*a fine clearance by the full-back 後卫将球一脚踢出球门区.
3 [C, U] space left clear when one object moves past or under another 净空, 余隙, 量（一物从另一物旁边或下面经过时, 两者间的空隙）
*a clearance of only two feet, eg for a ship moving through a canal 仅两英尺的净空（如船通过运河时）
* There is not much clearance for tall vehicles passing under this bridge. 高大车辆在这桥下通过时没有多大余隙.
4 (a) [C, U] (document giving) authorization or permission, eg for a ship or plane to leave a place or for goods to pass through customs(2) 许可（证）（如准予船只或飞机离开或货物通过海关的）
*get clearance for take-off 得到起飞的许可.
(b) [U] official permission for sb to work with secret information, etc 正式批准某人参与机密工作等的许可
*give sb security clearance 保安部门给予某人的机密工作许可.
5 [C, U] clearing of cheques at a clearing-house (clear3) （票据交换所内的）支票交换, 结算, 清算.

n
[U and C]
the process of getting official permission or approval for something
　She'll race if she gets medical clearance from her doctor.
　Morris did not have a security clearance .
[U and C]
official permission for a plane to take off or land
clearance for
　The pilot requested clearance for an emergency landing.
[U and C]
the removal of unwanted things from a place
　the clearance of minefields
snow/land/slum etc clearance
　flooding caused by forest clearance
[U and C]
the amount of space around one object that is needed for it to avoid touching another object
　There was less than a foot's clearance between the ship's sides and the wharf.
[U and C]
a process by which a cheque goes from one bank to another
[C]
an occasion when a player in a game such as football kicks the ball away from his or her goal