9 Grammatical Pitfalls


[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.
Origin of buoyancy
1705-15; buoy(ant) + -ancy
Related forms
nonbuoyancy, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for buoyancy
  • 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.
  • The twin hulls are made of fiberglass and filled with foam for buoyancy.
  • The buoyancy force is due to the water.
  • People have been known to survive days at sea, but only with a buoyancy aid.
  • Dancing with remarkable buoyancy, he rushed from one new experience to another.
  • The bassist nailed every tempo to the floor with buoyancy and unerring accuracy.
  • The creature lived in the lower, larger part of the straight shell and used the narrower part of the shell to maintain buoyancy.
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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