buoyancy

[boi-uh n-see, boo-yuh n-see]

noun

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 buoy·ance.

Origin of buoyancy

First recorded in 1705–15; buoy(ant) + -ancy
Related formsnon·buoy·an·cy, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for buoyance

Historical Examples of buoyance

  • He liked the buoyance of glider flying, the nearest approach of man to the bird, and thus far everything was going well.

    Mercenary

    Dallas McCord Reynolds

  • This buoyance was interrupted but once, and briefly, ere he gained the haven of his office.

    The Sturdy Oak

    Samuel Merwin, et al.

  • The fur of the coat seemed not to get wet through, and retained a certain amount of air that added to buoyance.

  • The blow which rendered her without control did not break her spirit, but it pressed out its buoyance.

  • A buoyance in the very air proclaimed that school days were over.

    Highacres

    Jane Abbott



British Dictionary definitions for buoyance

buoyancy

noun

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
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

Word Origin and History for buoyance
n.

1821, from buoyant + -ance.

buoyancy

n.

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

Online Etymology Dictionary, © 2010 Douglas Harper

Science definitions for buoyance

buoyancy

[boiən-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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Culture definitions for buoyance

buoyancy

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 Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.