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Definition of buoyancy:

  1. Cheerfulness; vivacity; liveliness; sprightliness; - the opposite of heaviness; as, buoyancy of spirits.
  2. 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.
  3. 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.


pertness, delicacy, bounce, airiness, ability, irrepressibility, impertinence, perkiness, sauciness, archness, resiliency.

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