Meaning of CLEARANCE in English

CLEARANCE

/ ˈklɪərəns; NAmE ˈklɪr-/ noun

1.

[ C , U ] the removal of things that are not wanted :

forest clearances

slum clearance (= the removal of houses that are in very bad condition in an area of a town)

a clearance sale (= in a shop / store, when goods are sold cheaply to get rid of them quickly)

2.

[ U , C ] the amount of space or distance that is needed between two objects so that they do not touch each other :

There is not much clearance for vehicles passing under this bridge.

a clearance of one metre

3.

[ U , C ] official permission that is given to sb before they can work somewhere, have particular information, or do sth they want to do :

I'm waiting for clearance from headquarters.

All employees at the submarine base require security clearance.

4.

[ U ] official permission for a person or vehicle to enter or leave an airport or a country :

The pilot was waiting for clearance for take-off.

5.

[ U , C ] the process of a cheque being paid by a bank

6.

[ C ] a clearance in football ( soccer ) and some other sports is when a player kicks or hits the ball away from the goal of his or her own team

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.