'Buoyancy' definitions:

Definition of 'buoyancy'

From: WordNet
noun
Cheerfulness that bubbles to the surface [syn: buoyancy, perkiness]
noun
The property of something weightless and insubstantial [syn: airiness, buoyancy]
noun
The tendency to float in water or other liquid
noun
Irrepressible liveliness and good spirit; "I admired his buoyancy and persistent good humor" [syn: irrepressibility, buoyancy]

Definition of 'Buoyancy'

From: GCIDE
  • Buoyancy \Buoy"an*cy\, n.; pl. Buoyancies.
  • 1. 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. [1913 Webster]
  • 2. (Physics) 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. [1913 Webster]
  • Such are buoyancies or displacements of the different classes of her majesty's ships. --Eng. Cyc. [1913 Webster]
  • 3. Cheerfulness; vivacity; liveliness; sprightliness; -- the opposite of heaviness; as, buoyancy of spirits. [1913 Webster]