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From: Webster's Revised Unabridged Dictionary (1913)

 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.
 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.
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