buoyancy

[boi-uhn-see, boo-yuhn-see]
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

nonbuoyancy, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
buoyancy (ˈbɔɪənsɪ)
 
n
1.  the ability to float in a liquid or to rise in a fluid
2.  the property of a fluid to exert an upward force (upthrust) on a body that is wholly or partly submerged in it
3.  the ability to recover quickly after setbacks; resilience
4.  cheerfulness

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

buoyancy
1713, from buoyant + -cy. Figurative sense (of spirits, etc.) is from 1819.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
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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American Heritage
Cultural Dictionary

buoyancy definition


The force that causes objects to float. According to the principle of Archimedes, when a solid is placed in a fluid (a liquid or a gas), it is subject to an upward force equal in magnitude to the weight of the fluid it has displaced.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Their diverting antics give the book its buoyancy.
To change their buoyancy and move up and down in the water, fish inflate an
  internal organ called the swim bladder.
The two styles play off each other with a buoyancy that belies the songs' often
  melancholy nature.
Air trapped in the cylinders provides enough buoyancy for the platform to float.
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