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Clearance (Noun)

Permission to proceed; "the plane was given clearance to land".

Nouns denoting acts or actions.

The air traffic controller gave the pilot clearance to take off immediately.
The company was granted clearance to begin construction on the new building.
The doctor gave the patient clearance to resume normal activities after a week of rest.
The pilot waited for clearance to enter the airspace over the busy city.
The police gave the protesters clearance to march through the streets, but only along the designated route.

Vertical space available to allow easy passage under something.

Nouns denoting quantities and units of measure.

The distance by which one thing clears another; the space between them.

Nouns denoting attributes of people and objects.

The helicopter pilot expertly judged the clearance between the rotor and the cliff face before landing safely.
The clearance between the car's bumper and the wall was only a few inches, and the paint job suffered as a result.
To avoid hitting the beam, the crew adjusted the scaffolding to ensure adequate clearance.
As the sailboat passed under the bridge, the crew anxiously watched the clearance between the mast and the structure.
The manufacturer's instructions emphasized the importance of maintaining a minimum clearance of 6 inches between the heat vent and any flammable materials.