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Definition of: buoyancy
(boi′ən·sē, b′yən·sē) noun
1. The property of keeping afloat.
2. Power or tendency of a liquid or gas to keep an object afloat.
3. Resultant upward pressure of fluid on an immersed or floating body.
4. Elasticity of spirits; cheerfulness. Also buoy′·ance.
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