clearance

Clearance is the process of getting official permission for something.

Example: She needs to get top-secret security clearance before working on the secret program.

Clearance is the permission for an aircraft to take off or land.

Example: We'll have to circle for a few minutes while we wait for landing clearance.

Clearance is a period when goods are sold cheaply to make space for new goods.

Example: The shops here often hold clearance sales after Christmas.

Clearance is the space between two objects so that one can move without touching the other.

Example: The truck only had two inches of clearance going under the bridge.

Clearance is the process of removing unwanted materials.

Example: Cities in Canada have to pay a good deal for snow clearance.