What is the meaning of Tarmac?

Tarmacadam.

Any bituminous road surfacing material.

The driveable surface of a road.

The area of an airport, other than the runway, where planes park or maneuver.

To pave with tarmacadam or a similar material.

To spend time idling on a runway, usually waiting for takeoff clearance.

tarmac (part of airport)

tarmac

Source: wiktionary.org