1. the speed of an aircraft relative to the ground, accounting for wind direction and velocity
Usage: aviation; commonly used in flight planning and navigation

Examples

• The pilot calculated the groundspeed by factoring in the strong headwind.
• With a tailwind of 30 knots, the aircraft's groundspeed exceeded its airspeed.
• Groundspeed is essential for determining accurate arrival times during flight.
• The navigator adjusted the flight plan based on the reduced groundspeed caused by the headwind.
• Modern aircraft use GPS to measure groundspeed with high precision.
• A groundspeed of 450 knots means the plane is traveling 450 nautical miles per hour over the ground.