- 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. - 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. - Cheerfulness; vivacity; liveliness; sprightliness; -- the
opposite of heaviness; as, buoyancy of spirits.
Meaning of 'Buoyancy' (Princeton's WordNet)
1 . buoyancy
[ n]
Meaning (1): - irrepressible liveliness and good spirit