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buoyancy

[boi-uh n-see, boo-yuh n-see] /ˈbɔɪ ən si, ˈbu yən si/
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 of buoyancy
1705-1715
First recorded in 1705-15; buoy(ant) + -ancy
Related forms
nonbuoyancy, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for buoyancy
Contemporary Examples
Historical Examples
  • It may have been the gradient of the hills, but somehow her gait had lost something of its buoyancy.

    The Law-Breakers Ridgwell Cullum
  • He mingled a certain frowning impatience with the buoyancy of his smile.

    The Market-Place Harold Frederic
  • The buoyancy of their irresponsible natures was reasserting itself.

    The Golden Woman Ridgwell Cullum
  • But it was the light in their eyes, their grinning faces, the buoyancy of their gait that held him.

    The Golden Woman Ridgwell Cullum
  • They were young still, and the buoyancy of the country they had adopted was in both of them.

    The Greater Power Harold Bindloss
British Dictionary definitions for buoyancy

buoyancy

/ˈbɔɪənsɪ/
noun
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for buoyancy
n.

1713, from buoyant + -cy. Figurative sense (of spirits, etc.) is from 1819.

Online Etymology Dictionary, © 2010 Douglas Harper
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buoyancy in Science
buoyancy
  (boi'ən-sē)   
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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buoyancy in Culture

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 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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