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buoyancy

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Buoyancy
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buoy⋅an⋅cy

  [boi-uhn-see, boo-yuhn-see]
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–noun
1. the power to float or rise in a fluid; relative lightness.
2. the power of supporting a body so that it floats; upward pressure exerted by the fluid in which a body is immersed.
3. lightness or resilience of spirit; cheerfulness.
Also, buoyance.

Origin:
1705–15; buoy(ant) + -ancy
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Buoyancy
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buoy·an·cy   (boi'ən-sē, bōō'yən-)   
n.  

    1. The tendency or capacity to remain afloat in a liquid or rise in air or gas.

    2. The upward force that a fluid exerts on an object less dense than itself.

  2. Ability to recover quickly from setbacks; resilience.

  3. Lightness of spirit; cheerfulness.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Science Dictionary
buoyancy   (boi'ən-sē)  Pronunciation Key 
The upward force that a fluid exerts on an object that is less dense than itself. Buoyancy allows a boat to float on water and provides lift for balloons.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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