terminal velocity

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The speed at which an object in free-fall and not in a vacuum ceases to accelerate downwards because the force of gravity is equal and opposite to the drag force acting against it.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the constant maximum velocity reached by a body falling through the atmosphere under the attraction of gravity