Buoyancy

n.	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.

Noun	1.	buoyancy - cheerfulness that bubbles to the surface Synonyms: perkiness
	2.	buoyancy - the property of something weightless and insubstantial Synonyms: airiness
	3.	buoyancy - irrepressible liveliness and good spirit; "I admired his bouyancy and persistent good humor" Synonyms: irrepressibility

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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