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clearance

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clearance/ˈklirəns/noun
pluralclearances
clearance
/ˈklirəns/
noun
pluralclearances
Learner's definition of CLEARANCE  
: an official decision saying that someone has permission to do something
[noncount]
[count]
   b  : official permission for an aircraft, pilot, etc., to do something
[noncount]
[count]
: the amount of space between two things
[noncount]
[count]
[noncount]  : the act or process of removing things (such as trees or old buildings) from an area
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