- an official decision saying that someone has permission to do something
- You'll have to get clearance [=approval] from management to go ahead with the project.
- The documents are only available to people with security clearance [=special permission given only to people who are approved to know or see secret things] from the government.
- She has a security clearance that allows her to see the classified information.
- The pilot got clearance to land.
- That flight has not received clearance for landing/takeoff.
- a clearance for landing/takeoff
- There was only 10 inches of clearance between the car and the side of the tunnel.
- The car has a road/ground clearance of seven inches. [=the bottom of the car is seven inches above the road/ground]
- a bridge with a 100-foot clearance above the water
- the act or process of removing things (such as trees or old buildings) from an area
- the clearance of forests for farming
- slum clearance to make room for new housing