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English definition of “clearance”

clearance

noun [U]  /ˈklɪər·əns/ us  

clearance noun [U] (GETTING RID OF)

If goods are reduced for clearance, they are offered for sale at a lower than usual price so that people will buy them and there will be space for new goods: a clearance sale

clearance noun [U] (GIVING PERMISSION)

official permission for something: The pilot announced we had received clearance for take off.

clearance noun [U] (NOT TOUCH)

the amount of space available for an object to pass through an opening without touching anything, or for two objects to pass each other without touching: The sign on the overpass says that its clearance is 12 feet, and our truck is 10 feet high, so we should have 2 feet of clearance when we go under it.
(Definition of clearance from the Cambridge Academic Content Dictionary © Cambridge University Press)
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