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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Buoyancy \Buoy"an*cy\, noun; 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.
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.
Such are buoyancies or displacements of the different classes of her majesty's ships. --Eng. Cyc.
3. Cheerfulness; vivacity; liveliness; sprightliness; -- the opposite of {heaviness}; as, buoyancy of spirits.
From WordNet (r) 2.0 [wn]:
buoyancy
noun
1: cheerfulness that bubbles to the surface [syn: {perkiness}]
2: the property of something weightless and insubstantial [syn: {airiness}]
3: irrepressible liveliness and good spirit; "I admired his bouyancy and persistent good humor" [syn: {irrepressibility}]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
57 Moby Thesaurus words for "buoyancy": adaptability, airiness, ascent, bounce, bounciness, breeziness, bubbliness, buoyance, carefreeness, chirpiness, daintiness, debonairness, delicacy, downiness, effervescence, elasticity, ethereality, extensibility, exuberance, flexibility, floatability, fluffiness, foaminess, frothiness, gentleness, give, gossameriness, jauntiness, lack of weight, levitation, levity, light heart, lightheartedness, lightness, lightsomeness, liveliness, perkiness, pertness, rebound, resilience, resiliency, responsiveness, snap, softness, spring, springiness, stretch, stretchability, stretchiness, tenderness, tone, tonicity, tonus, unheaviness, volatility, weightlessness, yeastiness
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