Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The tendency or capacity to remain afloat in a liquid or rise in air or gas.
  • n. The upward force that a fluid exerts on an object less dense than itself.
  • n. Ability to recover quickly from setbacks; resilience.
  • n. Lightness of spirit; cheerfulness.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The upward force on a body immersed or partly immersed in a fluid.
  • n. The ability of an object to stay afloat in a fluid.
  • n. Resilience or cheerfulness.

from the GNU version of the Collaborative International Dictionary of English

  • n. The property of floating on the surface of a liquid, or in a fluid, as in the atmosphere; specific lightness, which is inversely as the weight compared with that of an equal volume of water.
  • n. The upward pressure exerted upon a floating body by a fluid, which is equal to the weight of the body; hence, also, the weight of a floating body, as measured by the volume of fluid displaced.
  • n. Cheerfulness; vivacity; liveliness; sprightliness; -- the opposite of heaviness.

from The Century Dictionary and Cyclopedia

  • n. The quality of being buoyant, that is, of floating in or on the surface of water or other fluids; relative lightness.
  • n. The power of supporting a body so that it floats: said of a fluid; specifically, the upward pressure exerted upon a body by the fluid in which it is immersed.
  • n. Figuratively, light-heartedness; cheerfulness; hopefulness; elasticity of spirit.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the tendency to float in water or other liquid
  • n. cheerfulness that bubbles to the surface
  • n. irrepressible liveliness and good spirit
  • n. the property of something weightless and insubstantial

Etymologies

From buoyant +‎ -cy. (Wiktionary)

Examples

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