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90s Slang You Should Know


[boi-uh n-see, boo-yuh n-see] /ˈbɔɪ ən si, ˈbu yən si/
the power to float or rise in a fluid; relative lightness.
the power of supporting a body so that it floats; upward pressure exerted by the fluid in which a body is immersed.
lightness or resilience of spirit; cheerfulness.
Also, buoyance.
Origin of buoyancy
First recorded in 1705-15; buoy(ant) + -ancy
Related forms
nonbuoyancy, noun 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
  • The theme of their conversation spoilt his buoyancy for that afternoon.

    Life's Little Ironies Thomas Hardy
  • In the midst of the buoyancy of youth, this cherished one had dropped and died.

    Clotelle William Wells Brown
  • No one can dip into the Doctor without being convinced of this buoyancy of spirit, quickness of fancy, and blitheness of heart.

  • All the health and buoyancy of her was in her mouth, as well as in her eyes.

  • The buoyancy of the Southern temper withstood the shock of Gettysburg and was not overcome by the fall of Vicksburg.

    The Day of the Confederacy Nathaniel W. Stephenson
British Dictionary definitions for buoyancy


the ability to float in a liquid or to rise in a fluid
the property of a fluid to exert an upward force (upthrust) on a body that is wholly or partly submerged in it
the ability to recover quickly after setbacks; resilience
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

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
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 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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