1. The boundary region between the atmosphere and space, typically considered to occur at an altitude of about 80 to 100 kilometers (50 to 62 miles), where atmospheric properties transition from those of air to those of space.
Usage: technical; aerospace

Examples

• The aeropause marks the point where conventional aircraft can no longer generate lift.
• Satellites orbiting near the aeropause experience significant atmospheric drag.
• Scientists debate the exact altitude of the aeropause due to variations in atmospheric density.
• The aeropause is where the distinction between aeronautics and astronautics becomes meaningful.
• Spacecraft must reach velocities sufficient to pass through the aeropause to achieve stable orbit.