terminal velocity

noun
1.
Physics.
a.
the velocity at which a falling body moves through a medium, as air, when the force of resistance of the medium is equal in magnitude and opposite in direction to the force of gravity.
b.
the maximum velocity of a body falling through a viscous fluid.
2.
Rocketry, Ballistics.
a.
the greatest speed that a rocket, missile, etc., attains after burnout or after leaving the barrel of a gun.
b.
the speed of a missile or projectile on impact with its target.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
terminal velocity
 
n
1.  the constant maximum velocity reached by a body falling under gravity through a fluid, esp the atmosphere
2.  the velocity of a missile or projectile when it reaches its target
3.  the maximum velocity attained by a rocket, missile, or shell flying in a parabolic flight path
4.  the maximum velocity that an aircraft can attain, as determined by its total drag

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Terminal velocity is always a great word to know.
So is slumgullion. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a stew of meat, vegetables, potatoes, etc.
Encyclopedia Britannica
Encyclopedia

terminal velocity

steady speed achieved by an object freely falling through a gas or liquid. A typical terminal velocity for a parachutist who delays opening the chute is about 150 miles (240 kilometres) per hour. Raindrops fall at a much lower terminal velocity, and a mist of tiny oil droplets settles at an exceedingly small terminal velocity. An object dropped from rest will increase its speed until it reaches terminal velocity; an object forced to move faster than its terminal velocity will, upon release, slow down to this constant velocity.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
It isn't the terminal velocity that's so impressive, it's how quickly and
  effortlessly you get there.
They fall at terminal velocity and are warm enough to melt a little ice.
The amount of heat and pressure on his arms and body will be no different than
  at terminal velocity at closer to sea level.
There is an upward flow that is nearly equal to the terminal velocity of the
  cylinders.
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