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buoyancy

buoy·an·cy [ bóy ənssee, b yənssee ] or buoy·ance [ bóy ənss ]


noun 
Definition:
 
1. tendency to float: the tendency of an object to float

2. force causing floating: the tendency of a liquid or gas to cause less dense objects to float or rise to the surface

3. power to recover emotionally: the ability to recover quickly from a disappointment or failure

4. cheerfulness: cheerfulness or optimism

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