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buoyancy

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Buoyancy refers to whether something can float in water or air, or the power of water or other liquids to keep water afloat, or an optimistic disposition. (adjective)

An example of buoyancy is when a boat floats in water.
An example ofbuoyancy is when salt water has the ability to help things float.
An example ofbuoyancy is a cheerful person who is grateful for her job and who is generally happy and optimistic.

See buoyancy in Webster's New World College Dictionary

See buoyancy in American Heritage Dictionary 4

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