Definition of clearance noun from the Oxford Advanced American Dictionary

     

    clearance

     noun
    noun
    NAmE//ˈklɪrəns//
     
     
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  1. 1[countable, uncountable] the removal of things that are not wanted forest clearances Landscape gardeners have begun a clearance of the overgrown ground to make way for a new park. a clearance sale (= in a store, when goods are sold cheaply to get rid of them quickly)
  2. 2[uncountable, countable] 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 four feet
  3. 3[uncountable, countable] official permission that is given to someone before they can work somewhere, have particular information, or do something they want to do I'm waiting for clearance from headquarters. All employees at the submarine base require security clearance.
  4. 4[uncountable] official permission for a person or vehicle to enter or leave an airport or a country The pilot was waiting for clearance for takeoff. How long will customs clearance take?
  5. 5[uncountable, countable] the process of a check being paid by a bank Clearance will take seven days.
  6. 6 [countable] a clearance in soccer and some other sports is when a player kicks or hits the ball away from the goal of his or her own team
See the Oxford Advanced Learner's Dictionary entry: clearance