1 [uncountable and countable] 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.
2 [uncountable and countable] official permission for a plane to take off or land
clearance for
The pilot requested clearance for an emergency landing.
3 [uncountable and countable] the removal of unwanted things from a place:
the clearance of minefields
snow/land/slum etc clearance
flooding caused by forest clearance
4 [uncountable and countable] 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.
5 [uncountable and countable]BFB a process by which a cheque goes from one bank to another
6 [countable] an occasion when a player in a game such as football kicks the ball away from his or her goal

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